Discounts on Kalypso Games from Humble Store (Tropico 4-$5.99)
The Kalypso company is doing a promotion on its' games, so many of the games from that company are selling for a cheaper price. And since these games are selling at the humble bundle store, 10./. of the price is sent to charity organisations. So the ones on sale include Omerta: City of Gangsters, which was originally $19.99 for $4.99, Omerta: City of Gangsters Gold Edition for $29.99 for $7.49, Tropico 4, which was originally $29.99 for all the way down to $5.99, Tropico 4 DLC Edition, which was $39.99 for $9.99, and lastly, Jagged Alliance: Back In Action, which was originally $29.99 for $7.49. When you purchase any of these products, the download function immediately goes to your Steam account. But there are many more on sale, so you should go around and look for offers in the Humble Bundle website.