B2B ecommerce platform cost in 2026: SaaS, ERP module or your own store over 24 months

How much does a B2B ecommerce platform cost in 2026?

A B2B ecommerce platform costs an implementation paid once and a monthly fee, and the balance between them depends on the route. The table lists the prices each vendor publishes, with the source and the date we read them.

Microsoft bills both Dynamics lines annually and says its prices may differ by country. BigCommerce’s prices are in US dollars, and Shopify publishes the Plus fee in dollars, euros and pounds.

Route 1: a SaaS B2B platform

A SaaS B2B platform is a hosted store whose vendor runs the infrastructure for every customer, with B2B features either on every plan or on the top plan as an add-on. The two names most US and UK buyers compare are Shopify Plus and BigCommerce B2B Edition.

Shopify Plus and Shopify B2B

Shopify Plus costs $2,300 a month on a three-year term in the US and £1,800 a month (source, as of 2026-11) in the UK, according to Shopify’s help center. The same page says larger, more complex merchants may pay a variable platform fee based on revenue, and that the fee differs for B2B and direct-to-consumer orders. Shopify publishes no rate for it.

You do not always need Plus for B2B. Shopify’s B2B plan features page lists companies, net payment terms and quick order lists on every plan from Basic up, with up to three active B2B catalogs below Plus. Plus adds unlimited catalogs, catalogs assigned to a company and deposits. Our guide to Shopify Plus pricing for B2B lists every line, including the variable fee questions to ask.

BigCommerce B2B Edition

BigCommerce’s B2B Edition listing shows custom pricing with “Contact us for pricing” and says B2B Edition takes the BigCommerce Enterprise plan “to the next level”. Since 1 June 2026 that plan is called Performance and has custom pricing starting at $1,499 a month, according to BigCommerce’s 2026 pricing update. Confirm with sales which plan your B2B Edition contract requires.

The same update explains why the self-serve plans are not a cheaper way in for a growing B2B company. Scale costs $299 a month billed annually (source, as of 2026-11), charges 0.9% on GMV above $33,333 a month (source, as of 2026-11) and moves to Performance automatically once trailing 12-month GMV reaches $2 million. Contracted Performance plans are exempt from the Open Payment Provider fee.

Route 2: the ERP vendor’s commerce module

The ERP vendor’s commerce module is a storefront or portal that reads customer prices, stock and documents directly from the ERP, so there is no separate integration project. That is its real advantage, and for a company already running the vendor’s ERP it can be the shortest route to a working B2B store.

Microsoft publishes its prices. Dynamics 365 Commerce costs $210 per user a month (source, as of 2026-11), and the e-Commerce add-on $4,000 per tenant a month, both billed annually. The implementation partner comes on top. Other ERP-bound B2B products, such as Sana Commerce for SAP and Microsoft Dynamics, do not publish prices, as we describe in our comparison of an ERP B2B module and a custom platform.

If you run NetSuite or SAP Business One, ask your partner for the storefront licence and the implementation in one written quote, and put both into the same 24-month table as the other routes.

Route 3: a store you own on Medusa

A store you own is built once on an open-source engine and then costs a fixed monthly fee for hosting and maintenance that does not grow with orders or revenue. We build on Medusa, so the catalog, cart, orders, price lists and customer groups work from day one.

Our live store in 30 days starts from €5,000 net. It covers a B2B and B2C store on one catalog, with company accounts and customer price lists, B2C promotions, payments, shipping, hosting and monitoring. The ERP integration is not part of the starting price: we model it at about €2,500 net and fix the price once the data flows are mapped. Hosting and maintenance start from €100 net a month.

Medusa’s core is open source under the MIT licence, so there is no licence fee and no revenue share. Since 11 August 2026, role-based access control and single sign-on in the admin belong to the Enterprise Edition, which Medusa prices on request. If you need them, they are a cost line outside our starting price. The scope of a B2B build, from company accounts to quick reorder, is on our B2B ecommerce development page.

A 24-month B2B ecommerce platform cost model

On one scenario, the published lines alone range from about €9,900 to more than $110,000 over 24 months. The scenario: a distributor selling $100,000 a month online ($1.2 million a year), around 300 business customers with negotiated prices kept in the ERP, B2B orders paid by invoice on net terms, and three staff who would need Commerce licences on Dynamics. We use published prices and our own arithmetic, and leave unpublished lines as quotes.

We do not convert currencies, because each vendor bills in its own. The comparison that matters is structural: on the SaaS and ERP routes, the published lines are only the subscription, and the agency or partner work is still missing. On the own-store route, the build and the integration are already in the number.

That does not make the own-store figure a like-for-like quote for every company. €5,000 is the start of a build for the scope above. Complex pricing rules, several source systems or a migration of order history raise it, and we price those before work starts.

What the model leaves out

• Payments. Every route pays a payment provider. On Shopify Plus, orders through a third-party provider carry an extra 0.20% (source, as of 2026-11), while B2B orders paid by bank transfer on net terms carry none.
• The variable fee and the B2B Edition fee. Both are real and unpublished, so ask for them in writing.
• Your team’s time on workarounds. When the process does not fit the platform, you also pay in salaries. That line has no price list and often decides the result.

Our guide to ecommerce website cost shows the same 24-month method for B2C stores, with a calculator for Shopify.

Why agency price ranges are not a B2B budget

Agency ranges cover every kind of B2B project and do not say what is included, so they cannot replace a quote for your scope. OuterBox, a US agency, puts a B2B, large-catalog or integrated store at $75,000 to $250,000+ (source, as of 2026-11) in its May 2026 guide, without a calculation behind it.

Two quotes for the same B2B platform usually differ in scope, not in day rates. The same decisions move both: how many customers have their own price list, whether the ERP calculates prices, whether B2C runs next to B2B, how many systems exchange data and how much history has to move. How data ownership splits between ERP and store is covered in our guide to ERP and ecommerce.

When a ready-made B2B platform wins

A ready-made platform wins when your B2B process fits its configuration on a plan you can afford for years. In that case we advise against a build, including ours. Choose SaaS or the ERP vendor’s module when:

• a plan below the top tier covers your B2B process, for example three Shopify catalogs are enough for your price lists,
• every price and term lives in the ERP and the vendor maintains a connector to it, or you already run the vendor’s ERP and its module,
• you want the vendor to own hosting, security and upgrades and have no one to own a platform,
• B2B online is an experiment you may stop within two years,
• speed on an existing ecosystem matters more than control over every rule.

For which portal features a dealer network needs first, whichever route you take, see our guide to the B2B customer portal.

When your own B2B store wins

Your own store wins when the ready-made route needs the top plan, a B2B add-on, an ERP connector and agency work at the same time. Typical signals:

• You need B2B and B2C under one brand, and on SaaS that means more catalogs, more stores or more apps. See how B2B and B2C in one store works.
• Every key account has its own price list, and the plan that models them is the most expensive one.
• Fees grow with revenue, through a variable platform fee or a GMV overage, while what you use stays the same.
• The ERP decides prices, stock or credit limits with rules a connector cannot follow, so you need an ERP integration designed around your exceptions.

ImpregnatyBC is a store we built on Medusa for consumers and company accounts in one place, with net prices and volume tiers applied in the cart. Its previous store ran on Shopify.

If two of these signals describe your business, price your own store on the same scope: we launch a B2B and B2C store on Medusa in 30 days, from €5,000 net.

When your own store is the wrong choice

Your own store is the wrong choice when you would pay for flexibility you will not use. Do not build if:

• a plan below the top tier covers your process and you do not expect to outgrow it,
• your ERP data is messy, because any platform will show customers the same wrong prices and stock,
• you have a budget for the build but not for maintenance and development after launch,
• you need role-based access or single sign-on in the admin and do not want to pay for Medusa’s Enterprise Edition,
• nobody in your company will own the store after launch.

How to run the 24-month comparison for your business

You can run the comparison in one afternoon if every option gets the same scenario:

1. Write down your numbers: active B2B customers, price lists, products, orders a month, revenue and the two-year forecast.
2. Find the plan you will need in a year, not today, including GMV thresholds and the plan the B2B add-on requires.
3. Add the ERP integration to every option: connector app, partner project or a separate stage.
4. Ask each vendor, agency and partner for written quotes, including the variable fee, the B2B Edition fee and implementation.
5. Total 24 months and five years for the two cheapest options, and check where your ERP and current store disagree today, because every mismatch is work on every route.

If the result points to SaaS, buy it and rerun the numbers when you hit the next plan threshold. If it points to your own store, let’s talk about the scope for your first group of customers.