[Switch] Towerfall $7.50 (RRP $30) @ Nintendo eShop

I haven't played it, but it has good reviews as a fun couch co-op battle game.

Official bio: The classic archery party game from the creators of Celeste, featuring Switch-exclusive 6-player battles and more!

TowerFall is the ultimate version of the beloved archery combat/party game, featuring all of the content from Ascension and Dark World, and several Switch-exclusive additions!

Equal all-time low according to dekudeals.

Previous, expired OZB deal here

Edit: I just went to buy it and Nintendo told me I already had it. Ha! I have never played it and had completely forgotten I had bought it. Thanks for the reminder ferrisb :p