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:

If you're shopping Cyber Monday sales today, be sure to stop by Ebates first to maximize your savings.

Ebates is doubling its typical cash-back offers at 500 stores today only in celebration of Cyber Monday.