We design a commitment device for college students, "Study More Tomorrow," conduct a randomized controlled trial testing a model of its takeup, and measure its effect on tutoring attendance and grades. The device commits students to attend tutoring if their midterm grade falls below a prespecified threshold. Unlike other commitment devices tested in the education literature, the contract carries a financial cost for noncompliance. Students value the contract, with 10% takeup among those randomly assigned a contract offer. Takeup is not higher among students randomly assigned to a lower contract price, however. The contract does not robustly affect tutoring attendance or student course grades. Our results show that college students are willing to pay for study commitment devices.