DRM-free download site GoG is offering up two classics this week: Sierra's city-building sim, Caesar 3, and Activision's classic car combat game, Interstate '76 -- both for $5.99. You'll find that the former is already available to download, but you'll have to wait until Thursday to get behind the wheel of I76 and play Sly Stallone make believe. Watch out for traffic -- it's murder.
Source - Caesar 3 on GoG
Source - Interstate '76 on GoG