Yep, it's a great deal. Pretty much with Target clearance...PC games tend to get the price reductions nearly every week. If there are many at your store, then you can buy sometime to see how well the others sell and wait for it to go down lower. Otherwise if it's the only copy, then get it for that price.
I waited a long time for it to go down and it was at $17.99 and bought it. But $10, can't beat that. It's an awesome game and with a new bundle out with the expansion...hope to see that go down even more.