I'm interested in the physical book printing coming soon -- have you found a good vendor for printing and binding on demand?

I've been looking for vendors for a related service (printing formatted world bibles for writers from notebook.ai) but everyone I've found has either been way too expensive (unless you reach bulk quantities), low quality (often only low-grade paperback), slow shipping, and/or had other red flags that made me think twice about using them.

Would love to hear if you found any interesting prospects!