Fallen Enchantress, GalCiv 1 and 2, Eador Genesis, Disciples 2, and Endless Space are all on sale on steam right now. Most of the sales end on the 21st, but the Endless Space deal ends in around 14-15 hours. I highly recommend getting GalCiv 2 while it's only five dollars.

P.S. Stardock recently announced GalCiv 3, for those of you who missed my thread about it in the off-topic section, i.e. pretty much everyone. We need some way to make the off-topic section more visible, considering that the thread got seven views.