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In 2007, Alan Martin was a married college student with one child and another on the way. After suffering extreme sticker shock when buying his textbooks, he took out $250,000 in credit card debt, bought an arsenal of books and rented them out to other students.

With that, CampusBookrentals.com was born. Now, the company projects $50 million in revenue for 2014. Martin credits his early challenges with helping the company get this far.

"We fought so hard in the early days, that it taught us discipline," he said. "We had to be scrappy, thoughtful, and become profitable to survive."

Image Source: CampusBookRentals.com