The 1001's are pretty rare and I have only ever seen two or three on ebay. My 1001 was a craigslist find that a member here gave me a heads up on. The 900's aren't real common, but I have seen about 10 or so on ebay in the last year.
I may have to put a 1001 on the list for the future. That's just a cool looking and sounding saw.