Have a look at http://dyetransfer.org/. Also look at the Yahoo group for dye transfer.

I am planning on doing dye transfer, but with a bit of digital work for the separations, once I get my darkroom setup. You can sometimes find materials on ebay. As you noticed there is a new matrix film available, though I think only one run was made. Jim Browning mentioned that there may be another run in the future. Jim has also formulated dyes, and has found that you can get good results with regular fiber paper if you fix it out in hot fixer with alot of hardener.