Impulse is having a Memorial day sale this weekend with Sins of a Solar Empire priced at $4. The game is a masterpiece and at $4 any fan of RTS should make sure to pick it up. Also on sale is the Mass Effect bundle for $42. Lastly the Dragon Age: Origins bundle which includes the original game and the Awakening expansion is priced at $48. There are other deals as well, so check out the main Impulse memorial day sale page.