You can order online. Another place where you can order online. The NSF funds research and education in science and engineering, through grants, contracts, and cooperative agreements. This site has short descriptions of over 50 mathmatical games. These descriptions provide a general overview of the game, and if you have it in your budget to buy some computer software.
Online projects can take care of that.
Great Ideas in Science provides some free projects for students to participate in. This is the famed Great Ideas in Science rainforest connection web site. For the past few years, Dr. Willis has gone to Panama, and had an email correspondence with students in elementary schools. This is an online project started by Ellie Semel. Teachers can survey their classes and send the results to Ms. Semel, who will collate the data and make the results available for everyone via the web.