Like many commenters, I much prefer a publisher's version to Amazon's print-on-demand, so much so that when I deduce a book is print-on-demand from the thumbnail provided (POD front covers are universally primitive and basic), I continue looking at various other cover images until I find one that's clearly mass market publisher product. I buy it used, "Good" or better. I'll pay more for a used original than a new POD iteration.