We’ve all heard of Groupon, right? I know I have. I’m frugal. That’s why I’m on their email list so I can see the latest deals daily. But until today, I didn’t even know Groupon offers coupons for retailers like Amazon, Target, eBay, and Lego Store. And unlike Groupon’s regular deals, the coupons don’t require you to pay for the coupon. They are free!