You would have to be careful with the Coke ones. I have given it a lot of thought about doing a book. Here's where it's at. Do I do a book all on Coke machines, or a book on all machines. So I did some research. I have a licence with Coke, so it wouldn't be hard for me to do a book on all Coke machines, but would have to get the OK from Coke and then pay them royalty. For me to do a book on all models would get Coke's feathers ruffled. They didn't tell me no, but was not going to like it if I did one on all models. I have lots of books, and fliers and adds on machines I have collected over the years, so I have a lot of info to create a book. So not sure which way to go???

I believe Coca Cola would probably try and put the brakes on a new book.
Jeff Walters had to quit publishing calendars because Coke didn't like it for some reason.
Dinuba Dan was producing six-pack picnic coolers in several soda flavors but when he tried to get permission to do them in Coke, they told him OK..........as long as he discontinued all other brands

Probably best to use the resources we already have for price updates.