I bought this game at £9.99 and it's a bargain at that!
This is one of the best games I have ever played. I have an AGP X800 and a Athlon XP2800+ & 1GB RAM and it runs with no problems. I had to get an update from the Prey website (which you should do first anyway). While the story isn't the most inventive, the graphics are great, there are a whole host of novel ideas such as the changing gravity fields and special abilities, and above all it's enjoyable! BUY IT NOW!