It's 90% off when I clicked the link. Though, in fairness, I mis-read it as Portal 2 and was initially shocked to hear Valve using other stores. Was a bit of a dissappointment to see that it was a different game.
There are some bonuses - the collection includes a $10 rebate on Doom Eternal, which is already discounted to $49.94 on Amazon ahead of release. You'll also receive a controller skin and Doom game poster.[/Url]