Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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at89s52 is very inexpensive and it has many I/O but it doesn´t have advanced features like analog inputs or PWM outputs.It has many comercial and free software available.$2 at digikeyYou also have many atmel and PICs for about the same price with advanced features but less I/O
The picaxe is just a mcu chip unaugmented(augmented ones can cost even more than a basic stamp) and they need you to buy programming hardware etc to use them