The free shipping offer includes all photographs but not certain products. 
 

Things that are included:
Wallets, 4x6, 5x7, 8x10, 11x14, 16x20, 20x30, Stickers, all Custom Photos, and Foam Board mounting.

Things that are not included and have a flat shipping rate of $2.50:
T-Shirts, Photo Sculptures, Mouse Pads, Magnets, Puzzles,  Frames.