I'd wager you could prolly find some reasonable shit on e-bay- Bose makes a really good speaker system-
High end stuff would prolly be in the thousands- But I bet you could get a fairly good setup for about 500-800 (Cost mostly going to speakers)
Here is an interesting site i've found:
http://www.kabusa.com/ttables.htm#pg3a
I collect alot of vinyl myself. Mostly obscure shit that I use for samples and loops to make into breakbeats etc.