Refund, Please!

One of the best things about doing your shopping on Amazon.com is their very generous post-order price guarantee:

If Amazon.com's price for an already-released item decreases within 30 days after we ship the item to you, we'll be glad to refund the difference in price if you contact us within that 30-day period.

So if you buy something on Amazon, and a week (or three) later, the price drops a couple of bucks, instead of feeling buyer's remorse, you get the difference back.

The only downside to this is that Amazon isn't going to tell you the money you could save, you need to find it yourself.

And that's where RefundPlease.com comes in. After you buy something, you just hop onto Refund Please, enter your email address, the product number (ISBN/ASIN), and the price of your purchase, and they'll email you if the price ever drops. It's simple and very effective.

Personally, I've saved something like $15 using RefundPlease.com, so I highly recommend it if you ever do your shopping on Amazon.