Stumbled across this site today.... here you can get great bargains when they have sales, and if you are a strategy fan... then right now is a good time as you can get a Sid Meier Bundle which includes Civ III complete, Civ IV complete, Civ V plus two expansions, Sid Meiers Railroads, and two fighter plane sid meier games for $15.... or if you don't want the Civ 5 stuff you can pay as little as $1 - but they donate to charity (you even get to choose the amount that goes to the charity) so consider paying more.
Head on over to humblebundle.com
They also have a special on code masters games in a bundle as well at the moment.
Humble Bundle are fantastic. I'm yet to buy from them, but basically they have a bunch of games (say 5-6 games - usually themed together one way or another), whereby they ask for say $5 bucks. If you pay more than that, you'll get some bonus (free) games too. Or you can pay less than that. It's up to you what you pay.
They rake millions doing it, and money goes to charity!