Looks like Amazon is price matching Steam...
http://store.steampowered.com/app/50130/
http://www.amazon.com/dp/B004774ISM/ref=tsm_1_tw_s_vg_lhrl2w
http://store.steampowered.com/app/50130/
http://www.amazon.com/dp/B004774ISM/ref=tsm_1_tw_s_vg_lhrl2w