Much love to you for reviving a wonderful thread. I get an urge to indulge in all things Harry Potter related at least once a year.
In my shop we're selling three different types of book covers of Harry Potter. And it's made me wonder what the value of the original covers might be one day. I mean, there's clearly an abundance of those books across many a persons' homes as of now, of course, but I've no doubt some people will still get away with selling such books for hundreds online (eBay clickbait).
On another note, I'm still reading Prisoner of Azkaban (I so rarely find the time - and it's gotta be at the right time, when the world is asleep but you're awake kind of thing) - just 2 more chapters to go. One of my favourite books, easily.