You are probably better off with the ebook. They are DRM free so you can print it if you like.
That does sound a bit high, they should have media mail from USPS as an option, it's pretty much the cheapest way to ship books. Shipping 1lb is about $3, and material should be at max $1. They should easily be able to ship a book for around $4.
Media Mail is pretty freaking slow though.
It's a pre-order and scheduled for August. Sometimes <cough>massively and all the time</cough> book schedules slip. When Amazon lists it it is probably in editing.
A little of both. I don't see it available on amazon yet.