First off - my very favorite is Swagbucks.com! This one is the easiest and simplest way to earn and redeem great prizes and rewards just for searching the web. It really is that simple. There are no other obligations and all you have to do is search. I have written a whole introduction to Swagbucks here that you can read and get to know Swagbucks more.
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And my final recommendation is to use ShopAtHome.com when you do any of your online shopping at home. You will earn a certain percentage back when you go through ShopAtHome.com to make your purchases.
A good example is if you were to buy something from Target.com. Instead of going directly to Target.com, you would first go to ShopAtHome.com, type in Target.com in the search box, click on Target, there will be a number of coupons to choose from, click on one of the coupons that suites your shopping needs, you will then be taking to Target.com's website to make your purchases. You can then you the coupon code and after you have completed your order you will eventually be refunded a percentage of your total purchase (I believe it is around 3-5%) price back into your ShopAtHome.com account. After you reach $20, you will automatically be mailed a check. You can also refer your friends and receive $5 for ever friend that makes purchases through ShopAtHome.com.
I will from time to time let you know about a great deal that is occuring that you can purchase online and will let you know that you should then also go through ShopAtHome.com to make the purchase
RECOMMENDATIONS: I highly recommend that you create another email account for these type of offers to separate out this type of stuff from your regular emails. I have a special email account devoted to these type of offers.