I really want to play this game. I've put it on my wishlist 2 years ago, but I swear, I've never seen it on sale! I wonder if it's because technically it is still Early Access.
From their FAQ [0]:
> Are you planning to participate in Steam sales or Bundles?
> No. The price we ask is what we consider a fair price for the game.
[1]: https://www.factorio.com/blog/post/016-price-change
(I purchased it for myself at the $20 price, but I've also purchased it as a gift at the $30 price. I have definitely gotten my money's worth.)