Cash Back Earnings
Below is an extensive list (and will keep growing) of sites that you can sign up for and earn small amounts of cash and/or gift cards for making purchases. Why I decided to include this is that if you only use these on purchases you would already be making then it literally is like free money. However, it's easy to fall into a trap where you might make purchases you otherwise wouldn't have and then it's at best a wash. After all that is whole reason these exist in the first place. It's kind of a play on the psychology of the human brain and if you can resist making stupid purchases then you can definitely use these as a pretty solid income stream.
CouponCabin is a website founded in 2003 that provides online coupons, printable in-store coupons, and cashback at more than 3,500 online vendors. ... The claim is that CouponCabin can find you a discount for whatever it is you want to purchase, You can earn up to 20% cashback with select online partners