For the next 20 hours, the game "Supreme Commander: Forged Alliance" is available on Steam for just $2.59
(At least in America. I have no idea if these sales apply to other regions.)
Everyone reading this probably already owns a copy. But you might know someone who would want it. And you can buy it as a gift. For just about $5 you could buy two copies for people you know who like RTS games.
(And, in case anyone doesn't know this: the game you want to buy is "Supreme Commander: Forged Alliance." Not supcom 2, not the gold version, or any other version.)
Update: the sale is over.