The largest book selling on Amazon.com is about 1.77 million yen

It seems to be the largest in the world as this book and publication. The content is a huge photo collection with scenery photographs and portrait photographs of Bhutan kingdom. The facing size is 5 × 7 feet (about 150 × 210 cm), and the weight is about 130 pounds (about 59 kg). The price is $ 15,000 (about 1.77 million yen) with easel putting a book on it. If this size you can see portrait photos of life size. However, it seems tough to put it in the house first.

Details are as below.
Friendly Planet's BHUTAN

Mr. Michael Hawley of Massachusetts Institute of Technology has developed a plan, developed it, and developed technology to bind this huge book. The photographs were taken with the cooperation from the Massachusetts Institute of Technology and students and staff of the University of Washington, photographers and guides in Bhutan, students in Bhutan, and the Kingdom of Bhutan, and photographed more than 40,000 points.

Sales seem to be donated to schools and students in Bhutan and other countries. I want to donate money somewhere and it is just right for those who want super huge books.

Because Amazon.com has the exclusive right to sell online, it seems that there is no choice but to buy from here if you would like to obtain a new book from the net.
Amazon.com: Bhutan: A Visual Odyssey Across the Last Himalayan Kingdom: Everything Else

A reduced version of a two-page spread of 15 inches x 24 inches (about 38 x 61 cm) is also on sale. This is $ 100 (about 12,000 yen).
Amazon.com: Bhutan: A Visual Odyssey Across the Last Himalayan Kingdom: Books: Michael Hawley

By the way, it is said that the world's largest book is "4.5 m in length × 2.5 m in width × 1 m in thickness" in the "war period debenture register".

World's Top List - Wikipedia