We've all seen books such as biographies where most of the book is on normal paper, but there are sections (generally 16 pages) on glossy paper for photos. Can this be done on Lulu?
This cannot be done with any Print on Demand company. Only traditional presses do this as they print thousands of copies one book. It's worth the time and cost.
A workaround might be to print two books: A thicker book with all of your main text, and a second thinner book with the supporting photos and diagrams -- a supplement, if you will.