Good way to learn RT though, so dont give up on the idea - listening in to a full-ATC airfield is very useful, especially if you're learning somewhere with only FIS or A/G service (although even Speedbirds can have distinctly non-CAP413 RT at times)
I found some cheapo ones on ebay for very little, but I'd echo what Keef said - without digital tuning they'll be fairly useless. You would probably be best off trying to sweet-talk someone at your club into lending you their Icom for a weekend.