I only know all that, because you told me. Most people would just get suckered into joining Prime and being hit with a monthly charge they did not intend to apply for.
Have to say I find the library a great place for all my book, DVD's and CD's and best of all it's free
I'm not saying I don't buy the above items but for the last 10 years the library has allowed me to cut these purchases by at least 90%
If they don't have what I'm looking for they will 9 out of 10 times either source it for me through the Irish or English library system
and I believe that if they can't source an item for you they have the option to buy it and put it into the system
Pre Covid I was able to go to the library outside normal hours with "My open Library" which was a nice bonus