Still not in Your pocket but amazon to My knowledge never did reward for purchases. So in the pocket of a charity maybe even Your favorite. Not much either mind You but even little bits help!

1.5% donation on all goods except for a maximum $12.50 donation on all personal computers (desktops, notebooks & laptops). No donation for gift certificates that are not redeemable on Amazon.
Offering Earth’s biggest selection, Amazon.com seeks to be the place to find and discover anything you want to buy online at the lowest possible price. Find millions of unique new and used items across categories such as health and personal care, jewelry and watches, gourmet food, sports and outdoors, apparel and accessories, books, music, DVDs, electronics and office, toys and baby, and home and garden.