I shop at Burt and Company (online) for my sheet music. They stock editions called Musica Obscura and Musica Rara. A few weeks ago I bought Tausig's transcription of the Schubert D major March Militaire for $7 or something. When it came it was literally a bunch of photocopied pages! It's a good edition, though, and the piece is impossible to find, so I have no complaints. But if you can't find what you're looking for, go to
www.burtnco.com and do a search for Musica Obscura and/or Musica Rara editions. They do have great stuff -- like rare revised versions of Rachmaninoff pieces. And the shipping from Burt is incredibly fair -- if your shipment's under a pound, you get exact first class postage (sometimes under $1). The great shipping policy, along with the fact that "if it's in print in the United States, they'll find it," makes it a rare occasion that I buy sheet music anywhere else than Burt.
P.S. If you make an initial order of 10 different items, you become a discounted customer for LIFE. That means you get 15% off Henle!
Topic: Rare Sheetmusic