24 June 2008 - Talk About The Passion

"To this day, other than the collected books (of which there are 18) the only other official merchandise has been two calendars, a T-shirt (made for the Great American Comics: 100 Years of Cartoon Art event) and a 1993 schools textbook 'Teaching With Calvin and Hobbes' which received just one print run and thus remains of ludicrous value to collectors everywhere."

http://www.tatp.org/blog/?p=334

17 June 2008 - eBay forums

"Collectible Childrens Books on eBay

"Often I am surprised by what children's books sell for on eBay. A very competitive auction for this 1993 Calvin and Hobbes softcover... Teaching with Calvin and Hobbes by Bill Watterson Item number: 320260401509... 'Rare Calvin and Hobbes Book Teaching with Calvin and Hobbes By Linda Holmen, Bill Watterson, Mary Santella-Johnson... This is one of the rarest of all Calvin and Hobbes collectables.'"

http://forums.ebay.com/db1/topic/Booksellers/Collectible-Childrens-Books/1000686080?start=72#msg2010803157

8 June 2008 - So Hip It Hurts

"I searched the internet for the full list of Bill Watterson's published books and i found out that there is one book that is so very rare because there were only 2500 books printed.

"The rarest of the books is said to be 'Teaching with Calvin and Hobbes' and it was used to teach children with special needs."

http://hannlopez.multiply.com/journal/item/210