I'm a big fan of Populous II. So when (yes, this is true) I saw a short column in an old Amiga World magazine the other night about its successor PowerMonger, I had to take a look around for it.
And, happily, I found it for cheap.
The box is a little worn for wear, but otherwise it's in really nice condition.
Like Populous, and Theme Park, this game was also designed by legendary Peter Molyneux. It was released for the Amiga in 1990.