So, join the PTA in your local school and reap the benefits. Joining the PTA carries a membership cost that is trivial compared to the savings you can benefit from. Even before taxes, if you are on a 39.99/month plan, your savings on a normal two year contract could save you approximately $134. Almost enough for an upgrade to a premium phone every two years! That doesn't even include additional equipment discounts.
For more information call T-Mobile Customer Service at: (877)453-1304, 611 from any T-Mobile cell phone or PTA general information at: (800)307-4PTA (800-307-4782).