Major chains offer all of the "big" titles at this rate. There's no way they'd be pricing it low because of poor sales yet. I think it's #1 on Amazon.
I think it plays into the whole "democrats are more popular" game. Convince the feeble minded sheep that you're a winner because nobody wants to bet on a loser.
40% is standard.
you go to Barnes and Noble it will be 30% off and then your frequent book card is another 10%