The place to get some good tracks for TMO is here:
http://original.tm-exchange.com/
The game is pretty much dead, there are few random players showing up occasionally during the week, or at least this is as much as I can see when I'm online.
There are 2 servers running (yes, masterserver is still working), but 24/7 just one (outerspace) and I usually launch mine whenever I'm home (usually afternoons/evenings these days) but I rarely get any visitors.
So as conclusion, I would suggest to buy the game only if you have a spare few bucks and you want to try the game once more and maybe play online a little (but most likely alone, unless you're lucky enough to be available in the right time that someone joins you).
Keep in mind that with a new cd-key you won't be able to connect to an old account, you'll have to make a new one.