To be honest, Alienware was one of the main reasons I moved over to custom built PCs because of their ridiculous markup but it seems that now valve is reaching out to manufacturers to produce pre-builts running their SteamOS. The box itself looks quite nice and very console like, although I'm not sure why they decided to go with a controller instead of a keyboard and mouse for PC gaming.
http://www.alienware.com/Landings/steammachine/
http://www.alienware.com/Landings/steammachine/