Where can I buy a flapper dress in San Francisco?

A friend of mine is having a 1920s costume party. I thought I’d be able to find a flapper dress on sale now that Halloween is over but the Halloween store in downtown SF is already closed. There are a lot of places to order a flapper costume online but you can’t try on the dress and it won’t ship here in time for this weekend without paying a lot for a rush order. Anywhere else in SF where I can buy an inexpensive flapper costume (the fringe kind)? I’m looking to spend less than $50.