Here are a list of parts and links to SparkFun.com where I bought them. This is the basic set of parts you need to build and arduino and a circuit to read RFID tags into the arduino. I am assuming you have a breadboard, power supply and hookup wires already.
Crystal 16MHz $1.50
Capacitor Ceramic 22pF $0.25 (x2)
Mini Push Button Switch $0.35
RFID Reader Breakout $0.95
RFID Tag - 125kHz $1.95
TIP31A transistor (radio shack/local electronics store $1.50)
Door Lock is from ebay.
Door Fail Secure access control Electric Strike v5 NO $17.50 (kawamall, bay)
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