Missed Steam Store's 50% off sale on Kerbal Space Program? Your second chance awaits at GMG for the same Steam key. Part of GMG's "Hidden Gem" sale - though Kerbal is anything but a hidden title.

It's not often you find Kerbal Space Program under $20 these days, but it's now a flash sale headliner in GMG's 2017 Summer Sale. You'll need to act fast to pick this one up on the cheap getting a 50% instant discount + stacking 25% off coupon code. Once it's no longer a flash sale it'll go to 50% off only.

KSP is just one of those early indie success that rarely goes on a big sale now that its fully released (and out of the cheaper early access price point). Rare deal from GMG brings it down to $21. Typically $28-$30. Steam key.

Kerbal Space Program under $20 this weekend thanks to Mac Game Store sale. Limited time deal. Steam Play key (will activate and work on either Mac or PC without a problem).

Deal on Kerbal Space Program returns at MGS thanks to their Spring Sale. SteamPlay key which activates on PC or Mac without an issue. Probably the lowest price you can get the game since out of early access.