You might as well be throwing money away if you’re not using . This Chrome extension knows almost every trick in the frugal bible and will automatically try them for you (and the 3,000,000+ other people currently using it).

Here’s how it works:

Shop at Best Buy, Target, GameStop, Newegg or almost anywhere else? When you checkout, will instantly find and try working coupon codes.

Shop on Amazon? automatically checks other sellers for a better price, including sales tax + shipping. A notification will appear in seconds if a better offer is found.

The best part? It’s completely free. There’s literally no reason not to use it. Get Capital One Shopping .