Printful - White-label printing under your brand. Free shipping and 20% off samples + 3 day average turnaround.
Unixstickers by Sticker Mule - Stickers for fans of unix, software, coding and open source
Shapeways - Shapeways - 3D Printing Service and Marketplace
Polymail - Native email app for email productivity.
Zazzle - A wide determination of items in addition to simple-to-use plan apparatuses is Zazzle’s primary attractions.
Sticker.Place API - Get stickers for your app