Where to Buy Physical Resources:
MakerShed - Crafts, Electronics, Robotics, Tools, Toys, 3D Printing, etc.
Sparkfun Electronics - DIY Electronics, Kits, Tools, etc. (20% Educator Discount!)
Electronic Goldmine - Bargain Electronic Parts, LEDs, Batteries, Hobby Motors, etc.
Adfruit - Electronic Components, Kits, Tools, etc.
Jameco - Electronic Components, Kits, Tools, etc.