where are the Iron Sky: Invasion giveaways coming from?

From the Darkside of the Moon

90% off coupon

I think they're just buying it on Steam with -90% coupons, which are rather common ones.

As the others said, badge crafting potentially giving 90% OFF coupons for Iron Sky : Invasion. It brings the game to something like 4 € I believe.

From steam i would say.

El oh el.