Don't know if this been posted yet but greenman gaming has Darksiders II 30% off if you pre-order before May 17th. Use coupon code DEATH-ISMYS-AVIOR at checkout.
Really not worth the risk of pre-ordering from GMG (for $36), as if they block you due to their ongoing security issues you won't be able to cancel your order and you'll never be able to access the key. If you can stretch to a further dollar, the Limited Edition is $37 here, without the risk.
Looks like this game will be a good value for the money and it seems to be shaping up as a AAA title. Apparently it will take 25 hours just to critical path it! Who knows how long to beat the thing if you do all the side stuff! http://www.cinemablend.com/games/Darksiders-2-Over-25-Hours-Long-42830.html