It's a relatively slow weekend for game deals, but there are at least a couple noteworthy bargains. Microsoft's Games for Windows Live service has cut 75% off Borderlands, putting it at only $7.49 -- about the cheapest we've seen. Meanwhile, both Steam and Direct2Drive have reduced the Serious Sam titles by a substantial amount. GOG doesn't appear to have any actual discounts, but it's worth noting that the service has relaunched with its new design and offerings including Baldur's Gate.

75% off entire Serious Sam series
Garry's Mod $4.99 (50% off)
Star Ruler $19.99 (20% off)

More game deals after the jump. Games for Windows
Borderlands $7.49 (75% off)

Gratuitous Space Battles Complete $12.49
The Guild 2 Collection $49.99
Din's Curse $12.49
Spore $14.99

C&C Red Alert 3 $7.50
C&C Red Alert 3 Uprising $4.95
Red Faction: Guerrilla $6
Sword of the Stars $6
Gratuitous Space Battles $6
Serious Sam: The First Encounter/HD $2.50/$3.75
Serious Sam: The Second Encounter/HD $2.50/$4.95