I have to admit that it looks pretty cool but why the price discrepancy?
Or you could just buy a used used hardcover for $12.78 - or grab it new starting at $10.50 ...
As much as I love Amazon (around 2500 ebooks love(don't tell my wife)) I find something really odd like that every day there. It usually makes me laugh.
Ah well ,time to go buy a copy of this for ... some amount of money.