Love the site. One small thing:

The title says: “Save Money. Don't buy textbooks that you don't need” and immediately after, there´s the search bar.

This is confusing because, generally, when a title is followed by a search or button or whatever, the title tends to be the Call to Action to the following element (in this case, the search bar).

Having said this, having a negative word: “Don´t...” tells me to NOT do something when you clearly want me to search for something.

Hope this helps.