There used to be, but Amazon must have stopped allowing it/participating ... now no one does, except for "Shop for Change", and there the money goes to charity ... who wants that?

I always check http://www.valueconsumer.com before making any online purchase to see what rewards I can get from a particular store (I usually select the store, then try and get rewards, instead of letting the rewards drive my shopping). Just search for a store, and it will tell you who is partnered with them for rewards.