Hoffmann is coming out with a 2nd edition - not sure when or what this entails. There's also the kindle version which is a lot cheaper, but still expensive for an e-book.
Judaism Discovered includes the entirety of Judaism's strange gods along with several hundred more pages of research and information. I haven't read the other book so i don't know what else is included that isn't in the Judaism's strange gods. It's over a thousand pages in length. The 3 introductions (to the judaic, christian, and general reader) are over 100 pages.
Yes, it is hardbound.
When I got the book several years ago it was only $50. It was sold by an independent seller through Amazon, which does not carry the book itself. I have no idea why its price is so inflated now.