While I cannot remember if that was the actual price, I do remember it being very cheap before; I should have jumped on it. At 5 Knights of the Old Republic 2 is just outside the "sell lots of cards to afford it" range for me, and the lack of sales on the others (more specifically, the original Knights of the Old Republic) is just bizarre. Hopefully this isn't a trend that will continue with the Star Wars games on Steam.
EDIT: On that note, I hope the Christmas sale brings back Coal even though I doubt it will happen. The meta game got me to bought some games I wouldn't have otherwise considered and spend some time playing them. For some (The Binding of Isaac) this was a very positive thing for me.