Amazon is one of those special kinds of places where you might spend a lot of money in a short amount of time. However, you might want to keep track of other online deals. Cheapassgamer is where people post all kinds of deals, so definitely bookmark that site. I usually visit it at least once a day, usually in the morning EST, which seems to be when a lot of deals go live.
The only reason I say this, is because Amazon doesn't do a pricematch on every single deal out there.