Prices on Amazon go up and down every day. If you're planning on buying something in the near future, you can save money by waiting until the price goes down. That's obvious, but how can you know when the price on something you want goes down without checking Amazon every five minutes? That's easy: use a price tracker.

My Recommendation: Pricer Pro

There are many price trackers out there, but today I'm going to tell you about my favorite. Pricer Pro is a new Amazon price tracker (that I made), and it's the best. It has a clean interface and is very easy to use. Tell it which products you want to track on Amazon, and it'll automatically send you an email whenever the price drops on any of them.

The best part about Pricer Pro? You can sign up with your Amazon account. That means you don't have to remember an extra password, and the password you already use with Amazon remains safe. Pricer Pro never receives your password. When you log in with your Amazon account on Pricer Pro, Amazon handles the login process and simply tells Pricer Pro that you are who you claim to be.

How Pricer Pro Makes Money

Pricer Pro uses a service provided by Amazon called the "Product Advertising API". This service provides data such as a product's price, images of the product, and the product's name. Pricer Pro uses this data to help consumers find products to buy.

Pricer Pro then links to Amazon product pages with specially tagged links that tell Amazon that Pricer Pro should get referral credit. Any time a user buys something from Amazon after clicking on one of Pricer Pro's referral links, Pricer Pro gets a percentage of the sale.

Why You Should Use Pricer Pro

If you're on the fence, let me spell it out for you: there's no reason not to use Pricer Pro. Pricer Pro helps you get the best deals on whatever you want to buy, and that's it. There are no strings attached.

Photo by 401(K) 2012