The Steam Summer Sale is ending soon! SimplePlanes is 75% off on Steam and SimpleRockets 2 is 35% off. Also, you can get an additional 15% off if you get the Aerospace Engineer bundle, even if you already own one of the games. This means that if you already have SimplePlanes on Steam, then you can pick up SimpleRockets 2 for less than $9 bucks.
Thanks for playing!