There are a few redditors here. Try /r/audiophile. UE posts about a bajillion times a day there.

Anyway, I agree, look for steals on vintage stuff. I got a Sony PS-X5 with a Signet cartridge on craigslist for $25, and it easily competes with the best of under $500 modern turntables.
Search locally. If you can find turntables on Craigslist locally, check their vinylengine pages and read up on them via google (or your search engine of choice, of course.)
Things to look for in a turntable are weight (the heavier, generally the better), strobe light lock (ensure that the dots on the side of the platter appear stationary when spinning on tables with a strobe) and tonearm condition. Also check the needle and cartridge for wear (if they're included.) Dustcovers are good too, many dust covers have been cracked or are missing on vintage turntables, and can be very expensive to replace.