P.M.
The publishers who print books on your dime are probably not the ones who could help this book succeed. If the book is good, your husband can probably find an agent to promote it to various publishers who would not only print it at their own expense, but market it as well.
I've known a few people over the years who have paid big bucks out of pocket to print their beloved projects, sold maybe a dozen copies, and ended up with a garage full of unsold books. Basically all they got out of it was being able to call themselves "published authors." For this reason, those printing companies are often referred to as the "vanity" press.
Promoting a book is a huge part of the process of getting it out there. Printing is only the first step.
Good luck on this project.