Build a robot, made easy. “The Baby Orangutan is a complete control solution for small robots, even smaller than the original Orangutan. “Orangutan is based on the ATmega8 microcontroller. The WinAVR package allows you to write C programs for the ATmega8.”. Price: $24.95.
“You will still need two important items to get up and running: A programmer for the AVR microcontrollers: Atmel’s AVR ISP is a low-cost programmer that connects to a computer serial port. A power source: rechargeable batteries are generally the most practical.”.

Left: the Baby Orangutan package (3 x 2 cm).
Right: iBOTZ MR-1004 Hydrazoid©.
“This sound-sensing robot walks on four legs and sports fiber-optic eye stalks.”. (Pololu Corporation)