Groupon offers a Collage.com Personalized Phone Case for $15 or an iPad Case for $19. Plus, all orders placed using this credit qualify for free shipping. That's at least $25 off and the first such deal we've seen from Collage.com. The cases are available in collage or single-image styles. The phone cases fit iPhones 4, 4S, and 5 and the Samsung Galaxy S2, Galaxy S3, Note, and Nexus; the tablet cases fit all iPads from 2nd-gneration forward plus the iPad mini. This credit must be redeemed by May 15. Deal ends February 17.