RFID antenna and reader

I must make an RFID sniffer, then a reader and writer.


RFID sniffer:
http://www.openpcd.org/rfiddump.0.html
http://gnuradio.org/trac/wiki
http://www.ettus.com/
http://events.ccc.de/congress/2005/fahrplan/events/769.en.html


RFID reader/writer:
http://www.openpcd.org/about.0.html

I need to go get an evaluation for the price of all the parts...