There are thrift stores and there are vintage stores. There are some stores that are a blend of the two. And then there's Eons. Eons goes beyond your average vintage shop in that it could be considered a museum of fashion. A lot of their stuff is one-of-a kind antique clothing. You can easily find stuff from the 1930s up to the 1980s. Heck, in a few years we'll be looking at 1990s grunge here--time to dig out the Soundgarden CDs. I once bought a clutch purse here.
I stopped in the other day and even though I couldn't find anything that quite caught my eye, it was still a lot of fun poking around in here.