Last week Silent Storm was released by GoG for ten dollars. If anyone else has always wanted to try the game out but was deterred by the difficulty in acquiring a used, over-priced copy, now is the time to get it.
This game is unbelievably advanced for something published in 2003. I'd say that this game is the only one I've played so far that has a better destructible environment than X-Com.
Here's the link to the game: Silent Storm Gold Edition