The thing that annoys me, is I can never find a copy of PlaneScape... so I missed out totally on what appears to have been a pretty good game
They don't exist anymore dude. Just get the super awesome deluxe version online. It's what I had to do with Baldur's Gate (I missed out on it back in the day)
The modders have put together versions and bundles far superior to that of the original game, and they've fixed so much more. Don't feel guilty in the slightest. Is it even illegal if a game has long gone out of print and the company who developed it no longer exists?
You aren't missing out on a pretty good game, you're missing out on the 2nd best RPG of all time.