Apparently not the all time lowest price but it hasn't been this cheap since 2015. No key, instead you'll be prompted to link your Origin account.
From the website:
Engineer Isaac Clarke returns for another blood-curdling adventure in the sequel to the critically acclaimed Dead Space™. After waking from a coma on a massive space city known as "The Sprawl", the lone survivor of a horrific alien infestation finds himself confronting a catastrophic new nightmare. Battling dementia, hunted by the government, and haunted by visions of his dead girlfriend, Isaac will do whatever it takes to save himself and dominate the gruesome onslaught. With an arsenal of tools to dismember Necromorphs and new determination, an engineer will bring the terror to space.