User blog comment:Spritydove/Finding Morrowind/@comment-4057437-20121008014442

We got our (used) Xbox, (NOT 360), copy from Gamestop years ago. It is back-compatible with the 360, you may need to get a copy of the back compatibility download, we don't remember if it was needed or not. It is also available for PC. It wasn't released for Playstation/PS3.

GameStop doesn't carry XBox games anymore, but, Weird Al says it all: I Found it on EBay. (A quick check yielded over 200 active listings for xbox and PC)