Just found a new eBay store called Violetville Vintage, selling gorgeous vintage dresses from all decades, in the $100-$400 price range. Check it out.
Above: Gertrude Lawrence 1931
Above: 1935 purple satin Jeanne Lanvin gown, 1930s Madeleine Vionnet gown
Above: Gown from the modern fashion house of Vionnet, Fall 2007 collection
Read more about Madeleine Vionnet and her bias cutting innovations in the 1930s here