"Limited time", 50% off does not apply to 'The Missing Link', does apply to the Augmented Edition.
Works out to be 47USD if you substitute the AE edition for the ordinary… though I'm unsure if the AE edition still includes any of the DLC (I believe preorder gave you the DLC, not the AE).
Havnt played this game yet, but its got 9/10 on IGN!