Sign up for E-Bates!
e-Bates is this awesome website where you receive rebates for shopping online. Literally, they have EVERYTHING except for Amazon on here. You get 5 bucks for signing up, and they send either check/PayPal quarterly. If you're a big-time online shopper, you can rack up some serious money. All you have to do to get it is go to the e-Bates website before you go to whatever online store (say, eBay), and click on the store, and eBates will give a tracking number, which it will use to monitor any purchases you make. It's as easy as two clicks!
I STRONGLY recommend it!