Looking to finally hop on the Borderlands train? There's room for four! Steam has the game on sale this weekend for 50% off - that's $24.99 with a four pack available for $74.98.
Other deals include Modern Warfare 2 on the 360 and PS3 at Amazon for $40, as well as the Splinter Cell Conviction pre-order deal for $50.
What co-op deals have you seen for this weekend?