Hate to burst your bubble, but as a teacher I'd far rather get chocolate, wine, beer, fruit, biscuits (probably not flowers, as I am male

) etc. than a 'Thank Up' book.
OK, I may be old, knackered & cynical, but I doubt many teacher's will 'treasure' such a book for long. More likely that, being the polite types that we are, the teacher will say "oh, how wonderful, I'll treasure this" before putting it in the back of a cupboard to be forgotten about.
Also can't see why you are trying to sell it into schools - surely it won't be the staff who are actually buying the product?
Honestly - gifts for teachers: if cash is tight, a card (cost about £1.99) with a genuine handwritten message of thanks inside is absolutely fine. All the usuals, chocs, wine, flowers etc are also fine. Or buy a tin of celebrations, attach a note (make sure you/your child gets the credit for the gift!) and ask for it to be put in the staffroom. It will be most welcome (just don't do it on the last day of term - give it about a week before the end of term so that its there at breaktime when everyone wants that little chocolate lift.)
Best gift I ever got as a teacher was from a pupil who made me a mix tape - we'd often 'digressed' into discussing music during my bottom set Y10 physics lessons. I was genuinely touched that he had at least listened to something I said and took the time to make a tape based on my musical preferences.
Jeff