Gift Hero - The best wish list ever
Google Opinion Rewards - Answer quick surveys and earn Google Play credits with Google Opinion Rewards.
LoveSales - Find and save products you love, get alerted when they go on sale.
Receipt Hog - A fun and rewarding way to turn everyday shopping receipts into cash.
Wantt - Create & share wish lists for free
FreeMyApps - FreeMyApps lets you get rewarded for watching cool videos, playing fun games, and trying new apps.