(Update: New deals now available for MGSV, added in below).
Of the two AAA titles releasing on September 1st the big one is Metal Gear Solid V: The Phantom Pain. PC gamers are getting discounts up to 23% off at GMG dropping the price to $44.99. A good alternative is DLGamer where 20% off coupon DLG-QOPANFAE cuts the price to $47.99. There's no pre-load available for Phantom Pain so where ever you buy, you'll be at the mercy for your internet connection come Tuesday.
Joining MGSV is Mad Max, a title that's somehow gaining over 50% off in pre-order discount... making this a essentially a $30 title on launch day. You can read into that however you like.
The Humble Store is running an "End of Summer" Sale with loads of discount. Today is also the last day to grab their free copy of Stealth Inc 2: A Game of Clones - a surprising freebie that you probably don't already own 6 copies of.
In another freebie "deal" of sort, ArenaNet's popular Guild Wars 2 base game is now free to play with very generous restrictions in place for free players. More details can be found here.
Finally if you're looking for ultraportable laptops, there are some solid deals this week on Lenovo's popular Yoga series along with a MacBook Air and X1 Carbon (bottom of list). You're not going to be able to run MGSV on any of these (probably) but with the latest Intel integrated GPU, casual gaming is not too far of a stretch.