[quote name='Ctl-Alt-l33t']This game is also $19.99 on Steam[/QUOTE]
Steam Edition doesn't come w/ all the extra stuff in the Collector's Edition.
Plus, if you buy the retail edition on CD/DVD, you can ignore Steam. Who wants to attach their retail game CD/DVD copy of Prey to Steam, when the Retail Edition don't need to be attached to it....?