Kalypso Media have launched a weekly Humble Bundle that features a number of their strategy titles. Pay whatever you want and get Grand Ages: Rome Gold Edition, Imperium Romanum Gold Edition, Disciples III Gold Edition, and Airline Tycoon 2. If you beat the average price (currently just $4.42) you also get Tank Operations, Patrician III and Patrician IV. Pay more than $9 and you'll also get Port Royale 3 and Omerta: City of Gangsters. Potentially that's 9 games for $9.
As usual you can decide what portion of your price goes to charity (in this case American Red Cross and Child's Play). With little over 6 days remaining on the offer just over 21,000 bundles have been sold.