What year did they stop production of these?
Late 2005 I believe.
I am sure many people here have seen this post, but there's a LOT of information here:
http://www.head-fi.org/a/akg-k1000-a-collection-of-information-and-links
Man I sure wish I was able to get in on this deal in 2002:
http://www.head-fi.org/t/15541/whos-getting-in-on-the-k1000-sale
New K1000's for $359 USD!