2% reward program on some Ebay purchases when paying by Paypal. You accumulate the bucks over 3 months and then can use them against future Ebay purchases. They redemption period lasts about 30 days and then they expire. So today some Ebayers got 4% or 6% on their purchases.
Just a tip on the expiration comment, buy ebay gift cards. Theres a few legit sellers who list them and its a 1:1 trade. Basically like removing the expiration date from your ebay bucks.