> Does anyone know how to build a cheap transmitter/receiver

I've been looking ahead to an RFID project that's "supposed"
to be coming my way. One day. I've got quite a collection of
documents from Microchip and Atmel. The one I think that
would help you out is Microchip DS51115E. It's made up of
several smaller documents -

AN678
AN680
MCRF200 & MCRF250 data sheets
TB023
and ASK, FSK and PSK Reader Reference Guides

http://www.microchip.com/1000/pline/rfid/guides/index.htm

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