Just thought I'd let people who were on the fence about buying this know that greenmangaming has the game for $16.25 (33% off) after coupon code GMG35-5BRU6-ZDRX7 .
A game key will be sent after purchase which needs to be activated on steam to download the game. This code is good for one week so it expires November 17. Credit for this deal goes to Insomnia34 over at slickdeals.
I bought the game a couple days ago and have had a blast so far. Highly recommend.