Take a look at these- I have used them all, and they are all legit!
Ebates- earns you a $5 sign up bonus for new account. Has a $5.01 threshold, not including your sign up bonus, and pays out quarterly by check.
BigCrumbs- Pays you monthly to paypal on any amount you have earned!
MyPoints Earns you pionts you can turn into giftcards! I have cashed out several times- great program!
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Savings by RetailMeNot.com Coupons