Green Man Gaming takes up to 80% off a range of downloadable games for PC and Mac during its Final Frontier Summer Sale. (The sale banner says up to 80% off, but we found deeper discounts within. You must be signed in to your account to see these prices.) Discounted titles include XCOM 2, Star Wars: X-Wing Alliance, Deus Ex: Human Revolution, and Offworld Trading Company. A couple of best bets:
Green Man Gaming offers Steam downloads of Doom for Windows for $35.99. Coupon code "JULY20" cuts it to $28.79. That's $9 under our mention from two weeks ago of a boxed version and the lowest price we've seen. (It's also the best deal now by $8.)
Green Man Gaming offers Steam downloads of Transformers: Devastation for Windows for $14.99. (Note that you'll need to be logged into your account to see this price.) That's $3 under our mention from Cyber Monday and the lowest price we could find by $35.