Here are the top online pharma/healthcare marketplaces and ordering platforms retailers (U.S.-based pharmacies and healthcare retailers) commonly use, with a short note on who each is best for:

1. McKesson Connect — McKesson’s online ordering/marketplace for pharmacies and health systems (real‑time pricing, inventory, reporting). Best for chain and independent pharmacies that use McKesson as their primary wholesaler. (mckesson.com)

2. Cencora Marketplace (AmerisourceBergen’s Marketplace) — integrated front‑of‑store and non‑Rx product marketplace accessible through ABC Order; aimed at consolidating front‑and‑back‑of‑store purchasing. Good for pharmacies already using AmerisourceBergen/Cencora. (amerisourcebergen.com)

3. Cardinal Health — Pharmacy Marketing Advantage / PMA Commerce and Cardinal’s commerce solutions (front‑of‑store e‑commerce, integrated ordering/delivery). Suited to independent pharmacies that want hosted e‑commerce plus Cardinal distribution. (cardinalhealth.com, newsroom.cardinalhealth.com)

4. Independent Pharmacy Cooperative / Pharmacy Marketplace (IPC) — buying‑group/secondary wholesaler portal and IPC Warehouse for independents; useful for independents seeking lower‑cost secondary sources and GPO benefits. (ipcrx.com)

5. PipelinePharma — B2B marketplace and CTD/dossier database to connect buyers with international manufacturers for finished formulations and generics. Good for retailers seeking global sourcing or licensing leads (non‑U.S. imports require careful regulatory checks). (pipelinepharma.com)

6. GXgate — pharma‑focused global B2B marketplace and networking platform (APIs, finished products, APIs, equipment). Useful for connecting with international suppliers and manufacturers. (gxgate.com)

7. PharmaBazzar / Medibox / Pharmaflair (regional/global B2B marketplaces) — multiple platforms that aggregate suppliers and SKUs (often used for non‑Rx, OTC, supplements, devices and international sourcing). Useful for broader sourcing options outside primary U.S. wholesalers. (pharmabazzar.com, yourstory.com)

8. Medline / Henry Schein / other medical‑supply distributors — not Rx wholesalers but major online catalogs/ordering portals for medical supplies, DME, OTC and front‑of‑store items; important for pharmacies and retailers stocking medical supplies. (medline.com, athome.medline.com)

9. Amazon (Amazon Business / Amazon Pharmacy / PillPack) — Amazon Business can supply many non‑Rx medical products in bulk; Amazon Pharmacy/PillPack serve consumer pharmacy needs (less commonly used as a wholesale source by retailers but notable in the marketplace). Use for non‑legend supplies or DTC fulfillment options. (business.amazon.in, en.wikipedia.org)

Quick guidance and cautions

• For prescription (legend) drugs you must source through licensed wholesale distributors and follow state and federal requirements (state Board of Pharmacy licenses, DEA registration for controlled substances, NABP/Vendored distributor accreditation where required). Verify any supplier’s licensure before buying. (wolterskluwer.com, nabp.pharmacy)
• If you’re an independent retailer, joining a GPO/buying group (IPC, other regional GPOs) can improve pricing and give access to consolidated marketplaces. (ipcrx.com)
• For international sourcing (PipelinePharma, GXgate, PharmaBazzar), confirm regulatory compliance, import rules, and authentication—counterfeit risk and licensure vary by jurisdiction. (pipelinepharma.com, wolterskluwer.com)

If you want, I can:

• Rank these by suitability for a specific retailer type (independent pharmacy vs. chain vs. online-only retailer).
• Provide contact/registration pages for any of the platforms above or a short checklist for supplier due diligence (licensing, VAWD/NABP, lot traceability).