Oooh, super useful, thanks! Exactly what I needed. I only need a couple of pieces and am not that picky so I'm sure this will be great.

There's nothing here that I know of that's like you describe, but here is a link to a thread with my giant list of some other options. Good luck!
http://www.dcurbanmom.com/jforum/posts/list/431417.page

We are new to the area, and I'm wondering if there are any places that have good selections of used furniture. In our previous city, large estate sale companies would have monthly warehouse events where anything that didn't sell at their estate sales was available, all in one place. It was so much easier than craigslist, with a much better selection than the local thrift shop. Reasonably priced antique/vintage shops would be great, too. Thanks!