Step 1: Go to live.com
Step 2: type in "Cheap PS2"
Step 3: Click eBay link at top that says "35% off cashback." If it doesn't say that, ask here, certain keywords have been disappearing (I used "cheap wii" for 35%, now it's only 10%)
Step 4: Search on eBay for whatever you want to buy, make sure it's "Buy it now"
Step 5: Click "Buy it now" and if it's eligible it'll show you how much cash back you'll get. If you want the item, click commit to buy and pay for the item, you'll receive the cashback later. Make sure you're eligible and read the terms (most everybody is).
Step 6: Wait for the message in your inbox, that says something about cash back and read it and follow the instructions
What I got:
21.6" Samsung Monitor - $140 shipped after CB
Nintendo Wii - $218 shipped after CB (selling it because I already have one)
750gb HD - $80 shipped after CB
Do it quick before it's gone!
Other items that work:
PS3 (you can get one for about $265 shipped)
Xbox 360
Nintendo DS
iPod Touch
etc.