Some Suppliers and Vendors:
Educator Discount of 20% on SparkFun: SparkFun’s educator discount applies on all orders equal to or greater than $50. Any educator at a K-12 school, higher education institute, library or museum is eligible. The account should be affiliated with the institute (billing/shipping).
SparkFun Coupons: http://www.retailmenot.com/view/sparkfun.com
10/14 Update: Blast from the past: Remember, HyperStudio? My Learning Partner went to the Invent to Learn conference and found out that it can work with the Arduino board, http://www.rogerwagner.com/hs/A_Great_Way_to_Start/Arduino_Projects.html