Here is one of the weekend long discount deals through the Steam service, Sid Meier’s Civilization V.
Through this weekend you can purchase Civilization V at a 66% discount. The sale ends on Monday at 10am PST, so if you intend to purchase, be sure to do so before Monday as the sale only lasts through this weekend.
Steam usually has some special offer running, so if you are not a member of the Steam community and enjoy PC gaming, it might be worth your while to go and sign-up. Never know what great games will go on sale next and many titles within a series can be purchased in bulk at a discount rate as well.
I have included a trailer for Civilization V, for those who are curious about the general gist of the title.
Hope this helps start your weekend off on the right foot.