Printful

Printful offers a direct integration into Amazon's marketplace for Professional sellers, handling inventory synchronization across listings in the US, Canada, Mexico, and EU. Orders placed through Amazon automatically route to Printful's fulfillment network, with tracking updates pushed back to your seller dashboard in real time.

This setup works best for established sellers who've invested in Amazon's Professional tier and want to scale their print-on-demand business without manual order entry or inventory juggling.