I picked up Rowan's MiG Alley again this weekend for $4.99(dunno what happened top my original cd) . I updated it with the BDG 0.80 patch (BDG is a group who are working on the source code for Battle of Britain and MiG Alley now that Rowan is no more). It's looking a bit dated now but is still a lot of fun and it gives me my Sabre/MiG-15 fix while I'm waiting for Target: Korea.
For that price you really can't go wrong. If you happen to get hold of it don't forget to check the MiG Alley forum on SimHQ for details on updates.