Equator Books in Venice, on Abbot Kenney, just bought out a serious 30,000 lp collection. The first 2,000 records arrived in July. They have a small room off the bookstore. Was there the first day the collection was made available and was able to dig out 100 pristine records.
PS: Per capita, Seattle has more "mom and pop" stores than any city I known. Great place to dig.
Hard to find good album stores in the Vegas although the Virgin Megastore has a nice album collection of new titles.
I also recommend Better Records/www.dccblowout.com in 1000 Oaks, CA. Tom Post, the owner,specializes in old rock and jazz and personally listens and ranks each album by quality; you will pay dearly but the best source for amazing fidelity.