Amazon completely changed shopping as we know it. The company has single-handedly put countless brick and mortar rivals out of business by undercutting their prices and by offering almost anything consumers might need under one virtual roof. Add fast shipping and a smooth shopping experience into the mix, and you’ve got a recipe for success. But even though low prices played a huge role in making Amazon the retail giant it is now, the company doesn’t always offer the lowest prices around — and now there’s a simple tool that tells you when that’s the case. CNNMoney brings our attention to a new website called PriceJump, which is run by Savings.com and was launched earlier this week. The site couldn’t be simpler: