I do the majority of my holiday shopping online and I've received over $50 cash back thanks to Ebates! It's simple-- create an account and use an Ebates referral link every time you buy something online. They even have a Chrome extension to make it even easier by reminding you every time you go to an eligible online store!
As if FREE Cash Back wasnt good enough, if you go through my referral link, you will get $10 after your first $25 or more eligible purchase! So, if you spend $25+ online (think Target, Kohls, ebay, Etsy, etc...) through an ebates referral link, you will earn cashback AND a $10 bonus!
My referral link---> https://www.ebates.com/r/SHANNO18369?eeid=28187