Libro.fm also sells DRM free audiobooks, has a nice app, and will work with indie bookstores to be their audiobook provider as well as turn over a percentage of sales..
Change your DNS servers.. I use openDNS, but there are lots of other choices. If the Pi isn’t in use set it up as a Pi-hole (DNS server / ad blocker), so you’re not use your isp provided router for DNS.
For a used bookstore inventory could be done once a year like we do to avoid drift in our data.. but more realistically everything would be scanned as it comes in and out. Why that doesn’t already happen baffles me too!
When we do inventory of books, about 7000 of them, it takes a team of 3 or 4 people scanning labels on the back of books, about 5 hours to scan them all. Add 3 or 4 more people in to watch the computer(s) for errors as scans come in. Then add an hour or two to pur things back to normal.
For a used bookstore with no pre made labels and books stacked and crammed I’d double the time. Then add some more for books that don’t have a barcode on them...
This is with laser barcode scanners and dedicated machines per device. Phone scanners are much slower.. either way, give me a crew of people, scanners, etc and we could scan about 10K books a day.