http://www.reddit.com/r/GameDeals/comments/15kiyv/
It's on Green Man Gaming, the game is on sale, then if you use the promo code GMG30-DPLIM-DN831, it bumps the price down to $17.50~ It's for Steam.
I picked up my copy with this~
/mightnotseemeforaweek
SKYLER! I wanna keep my money!
STAAAHHP!
STAAAHHP!
SPEND IT AAAAALLL