In addition, you can mail the book directly to the publisher along with a proof of purchase. The publisher will send you “$30 within 30 days of receipt of book ($26 for book, plus $4 to cover mailing charges).” Here is the address:
Attn: Trade Sales/KR
222 Berkeley St.
Boston, MA. 02116
The publisher has also taken out a number of ads reminding readers that they can get refunds for the book.