Here's the new Amazon link:
http://www.amazon.com/The-Martian-No...dy+weir+kindle
The publisher is Crown, and the price is $9.99.
It looks (perhaps?) that the author has hit the big time.
The cover is now different, too.
Andy Weir is the author.
ADDED: It appears as if the film rights have been negotiated, which would account for a well-known publisher taking it up and with a newer, higher price.