i wouldn't really knock cash converters for cheap gear. about 3 years ago, got two minolta X-700 cameras, one with a 50mm f1.4 (a bit of dust but no fungus) the other with the 35-70 f3.5 zoom (clean), each set cost me $90, still using them today, haven't had any problems with either. (did have to replace the bump foam for the mirron in one body and that's about it.)
other gems were electro 35 GSN's and GTN's, cheap at $20 - $50, some clean, some for parts. best buy was a $25 Nikkor 105 f2.5 AIS lens (clean and crisp) but that one was a very, very rare occurance.
just remember, buyer beware, there's a lot of junk in there, look carefuly and be prepared to get disappointed.