8 Hacks That Will Save You Money Every Time You Shop at Amazon
5. Know when the prices go down

Track those prices without hassle by using online tools, like Tracktor, to monitor Amazon prices. Another site is CamelCamelCamel.com. This site can alert you if prices on certain items on Amazon go down.
6. Enjoy free shipping with pre-orders
The online retail giant offers free shipping for purchases worth $25 and up. But if your cart hasn’t reached that amount, you can pre-order a product that has not been released yet (including a movie or a game) so that you’ll enjoy the free shipping privilege. You’ll only be charged for the pre-ordered item once it’s been shipped. You can even cancel it later.