Stellaris and all of the DLC (except Megacorps) is on 75% off at Steam right now.
Also, Distant worlds: Universe is on at 75% off.
They are both on sale for the next 48 hours.
Whats the point of them not selling megacorp at the sale price. Paradox are just a tad on the annoying side when it comes to their selling strategy. I understand how it works, but the way it works doesnt really work for me (that makes sense doesnt it)