https://www.retailmenot
*TODAY ONLY*
Need a retailmenot.com account and at least a paypal email address to receive funds. Click the activate button in the link once you’ve signed into retailmenot.com. Make a $50 purchase before shipping (free with free nike.com membership) and tax and receive $20 cash back within 15-20 days. After it is deposited, transfer to your paypal account. I have received cash back from this site before, so I know it works!
*Update: May use a giftcard to checkout, but may not purchase a giftcard.*