http://www.greenmangaming.com/games/...ivilization-v/

While it's not exactly my favourite Civ game, it still does enough different things that I recommend playing it if you like strategy games. And this is the one of the best prices I have seen so far.

Use my referral link to create a new account and both you and I will get a $5 credit at the site (after your first purchase): http://www.greenmangaming.com/?gmgr=bigofiki