Amazon offers Prime members Deus Ex: Mankind Divided Day One Edition for PlayStation 4 or Xbox One for $19.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $4.98.) That's $4 under our mention from five days ago and the lowest total price we've seen. (It's the best deal now by $23.)
Don't mind going to the store? GameStop also has it for PS4 or Xbox One for $19.99 via in-store pickup.