if you're mainly into vinyl, i highly recommend getting on insound's mailing list: http://www.insound.com/
They have warehouse sales in greenpoint about 3-4 times a year consisting mostly of vinyl along with some CDs, t-shirts, and posters. it's mostly newer stuff, but i've been able to find some old punk 45s and 70s rock LPs now and then.
also: not to hijack the thread, but does anyone have recs for a good place to get affordable (maybe even used) stereo equipment? i got a turntable for christmas, but that's all i have - i need speakers, amp, etc.