Wichita Falls kids can start getting rewarded with tokens that can be exchanged for free books that they get to keep. Awesome news for Wichita Falls kids as two book vending machines are being installed at local elementary schools. Example of Book Vending Machine at Another SchoolStudents will have the opportunity to earn tokens throughout the school year. After October 15th, your kids can start earning tokens for the book vending machine. According to a study, these vending machines work like a reward system for a child.