Excited about the new space-faring instalment to Civilization? That's an understatement. Unfortunately, it's not available right now, which makes it incredibly difficult to play in the current time slice we occupy. Sins of a Solar Empire: Rebellion, on the other hand, is just $US10 on Steam and it might be enough to tide you over until Firaxis has completed its work.
Rebellion usually retails for $US39.99 on Valve's online store front, but for the next 38 hours, it's 75 per cent off. Sure, it doesn't have "Sid Meier's" before it's name, but it's still a darn good 4X... and it's gorgeous to boot.
If spaceships blowing up other spaceships doesn't take your fancy, Stardock has a bunch of other titles on sale, in fact, you can grab a bunch of them for $US44.99, including Galactic Civilizations II: Ultimate Edition, Fallen Enchantress: Legendary Heroes, Demigod and of course Rebellion.
Note that these games aren't discounted individually — you'll have to buy the bundle to get them cheaper.