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GOG is running DRM-Free Time Machine Sale. 30 classic games from 1983-2013 will be on sale for up to 90% off. The time for each sale is customer dependent. You can vote to add a second or subtract a second from each deal.
The current deal is Police Quest 1+2+3+4 for $2.99 (70% off).
There’s also a Deadlock Special Promo deal. Buy both games for 33% off otherwise it’s full price for each.
Deadlock: Planetary Conquest $3.99
Deadlock 2: Shrine Wars $3.99