Daily Deal at GamersGate: Sword of the Stars II
for 8.99 $/€ (70% off). Requires Steam.
Only get it if you want to support the developers. The game was released as a mess, calling it merely "unfinished" would be a euphemism. Basically a dev admitted that they hgad to release it to fund further development. Since then, patches have improved the situation, but the game is still far from finished. Personally, I'd recommend getting the previous game and its expansions, as linked above by ABH20.