If you're shopping Cyber Monday sales today, don't forget about Ebates.

Ebates is doubling its cash-back rebate offers at more than 500 stores today for Cyber Monday.

If you spend $100 at Gap today, for example, you'll get 10 percent back from Ebates. A normal rebate at Gap is just 2 percent.

And remember, that's on top of any deals you get directly from the retailer.

Not familiar with Ebates? It's a shopping portal that pays you to shop.

Here's how it works:

I love to get groceries for free with the help of coupons. But I like it even better when the store will pay me to shop.

And I'm not talking about a drugstore deal reward to spend later.

I'm talking about cold hard cash back in my pocket.