Steam has all five episodes of Sam & Max: The Devil's Playhouse
for a total of $9.99. That's 71% off the normal price of $34.99.
If you don't have S&M:TDP, I'd strongly suggest getting it. This sale is ONE DAY only. Unfortunately, that day is TODAY, which means some people here will probably miss it, but if you do read this post in time, go get it!