Edit: I should answer the original question too!
It really depends on what you're looking for. I'd suggest the TR47 versions, because the sound is amazing, and the video is pretty good too. That set is barebones, but it should work on any DVD player. Read the stickies for information about the different versions.
As for availability, a number of the sets are available for download with a BitTorrent client through www.myspleen.net. Alternatively, you can often talk to the creators (or Rikter), and they can help you get a set, either for free or for a small fee (the cost of the blank DVDs and postage, etc.)