EDIT: Thanks Bopsilove, VIP membership (free) needed, get that at https://www.greenmangaming.com/vip/vip-deals/
Steam key. 61 cents. Today only (or until keys run out)
https://www.greenmangaming.com/games/injustice-gods-among-us-ultimate-edition/
EDIT one minute later: I had the game installed to the hard drive (but needed the disc in the system), completely forgot, now I can buy the game digitally. Heads up for anyone else with this problem!
I want to buy Forza Horizon digitally but I used to play on a disc, so on the screen that...