Thanks for that list. I only got into listening to audiobooks last year when I started walking a lot more (due to Covid-19 restrictions). My local public library had a deal with Bolinda where library members could rent audiobooks at no cost. The catch is that (due to artificial scarcity), the user usually has to wait a couple of months before the title they're interested in becomes available. It turned out that Harry Potter and the Philosopher's Stone was immediately available so after listening to that, I continued with the rest of the series. When I became too impatient to wait for the next title to become available, I was able to purchase non-DRM MP3 files from JK Rowling's own site, Pottermore.