Not that much. Probably around $30-40USD at an anime con for a manga, not including the secondary one I got that kinda doubled the price.
Otherwise, for books plural, not me, but I am sure the Christmas gift boxset of a manga series I got probably around $100+USD would be the most expensive books I’ve seen purchased. College textbooks excluded.








Hell, the music player app I use on my phone ( auxio ) just recently changed a UI component that I now hate to death. Scroll down a list and you’d see a scrollbar, which is usually faster for my over 500 songs. When you’d use the scrollbar, it used to display a square with whatever letter you are on in your list. They replaced it with a horrific spinny gear looking thing! Very first world problem, I know, but I absolutely hate it!