what about getting A1200 motherboard only, should be fairly cheap with postage, and if you are a real fan, you'll enjoy building 'powertower'. I have just seen one on amibench.
but of course the cheapest would always be friend/flea market as mentioned.
I believe A1200 has been massively produced unlike say A2000 turbo cards. One friend even told me he threw away his 030 A1200!! such a shame.. :-(