Suppliers

ComponentSuppliers

MechanicalSuppliers

RobotSuppliers

MiscElectronicSuppliers

Anykits cheap kits

BatchPCB.com For making small batches of PCBs

BiPOM Electronics Lots of microcontroller boards

E-Clec-Tech primarily devoted to the study of human anatomy as it relates to robotics...lots of kits!

Hobby Engineering Lots of stuff!

MUTR Weird stuff, including interesting materials like plastic and kevlar

Robotics Group (programmable power supplies)

Surplus Shack surplus optical and electronic items

VEX Robotics aluminum chassis robot parts

Wright Hobbies Robotics (DevBoard cheap AVR board)