Unfortunately, Amazon.com is not a big participant in rewards programs. They've even pulled out of UPromise. I used to get around it by ordering an Amazon.com GC from Giftcertificates.com but now they charge a 95¢ service charge for all emailable GCs. That surcharge offsets any amount that I would make from a reward so I've given up on getting rewards when shopping at
Amazon.com.
For that reason, when I'm ordering books or DVDs, I almost always checkout Barnes and Noble's website. Their prices are ususally close and they offer free shipping as well. And there are many RPs that offer rewards points for purchasses thru them.