If you watch tv I'm sure you've seen the commercials for Bing, microsoft's new search engine. Who needs that when you have google?
anyhow, I discovered bing.com/cashback which is very cool. They also did it as live.com/cashback i believe.
Anyhow, sign up and you get cash back for online purchases that are signed up w\ bing. Ebay purchases are 8%. You search and it shows you items that have cashback. newegg.com does 2.5%, some dell ad's are 10%+