Ya know, that is not the most ridiculous explanation. I accept it and will adamantly defend it as the absolute truth.

Camelcamelcamel.com

You can input the URL for an Amazon product and it will show you it's price history so you know if it's really a sale or if they are just bs'ing the price like they did for this post.

I have no idea why the website has that ridiculous name. Lol