Steam cuts up to 85% off a selection of downloadable games and game DLC for Windows or Mac during its Summer Sale, with prices starting at 24 cents. It also offers a selection of daily deals and flash deals. That's tied with our mention from three days ago as the largest sale we've seen from Steam in over a year, and puts many titles at the lowest prices we've seen. New flash deals happen every eight hours, and the current selection of daily deals ends today at 1 pm ET.

A best bet is downloads of Kerbal Space Program for Windows or Mac for $13.79. That's $9 off and the lowest price we could find. Kerbal Space Program is an open-ended, multi-genre game where you get to create your own space program and design your own rockets.