Honestly, my next book(s) I've been contemplating using Lulu myself. I just did a PoD Google search. This was just posted today. There are some names on here I hadn't heard of so I'm going to have to check it out too.

I think online store fronts like Red Bubble do PoD as well. It's been awhile since I had a store there.

https://self-publishingschool.com/print-on-demand-books/