https://www.gog.com/promo/20190722_weekly_sale

If you have a few bucks and want to visit or revisit how things were "back in the day" you can get a lot of bang for your buck!

B17 Flying Fortress The Mighty 8th
F117A Nighthawk Stealth Fighter 2.0
Falcon Collection
Knights of the Sky
Silent Service 1 & 2