Amazon shoppers: I recently discovered a couple of nifty ways to save a little money at Amazon. First, as this article explains, if an item is marked down within 30 days of your purchase, you can use a refund request form to ask that the difference be refunded. Since prices are constantly fluctuating at Amazon, this seems like a great way to get the best price on whatever you’re buying. Second, users of Amazon’s search engine A9 can get an extra 1.57% off of all their purchases. It’s not a huge discount, but it can add up, especially on those big ticket items. Here’s how to qualify.