This computer extension will help you find out if Amazon actually has the best price!

If you shop on Amazon under the impression that it has the best prices, then you may not get the most out of your money.

Early adopter. Deal hacker. Penny pincher. You probably have friends like us. We’re one of the first to download new shopping tools and find obscure coupons, and we’re proud of it. After years of hacking online shopping, we decided to build a tool to do it for us — .

While you shop on Amazon, Capital One Shopping, a computer extension, instantly helps you find the best price. Look, we love Amazon Prime. Free 2-day shipping is great and, like everyone else, we enjoyed not knowing how much it actually cost. Well, guess what? It isn’t free to move atoms from one location to another, and that cost gets baked into the price you pay.

Here’s how it works:

While you shop on Amazon, automatically goes to work in the background. If a better offer is found, a notification appears instantly. It shows you the final price of the item (including sales tax + shipping), and notifies you of the delivery date. Same product, just cheaper.

Sometimes you need your order in 2 days, and in those instances, Amazon Prime is the answer. Though, the reality is that if you waited just a few more days for even half of your orders, the monthly savings with Capital One Shopping would probably pay for your yearlong Prime subscription.

The best part? It’s completely free. Get Capital One Shopping for your computer .