What country do you live in? Crichton's books are some of the most reprinted in the world.
I see them at goodwill all the time.
I'm in Australia. Crichton was really popular here too, but I've not been seeing many of his books in op shops for a few years now. It may be that I just have terrible timing/taste in op shops. There are a shitton of his books on eBay, but many titles are a lot cheaper than others.
There's not a whole lot of British-ism to Discworld I've noticed, being from the UK granted, and honestly I think you'll find that just the fundamental ridiculousness of the work pretty compelling. As a note for future Discworld reading if you do continue: there's no real continuity through the whole lot in the form of order of release, they're all just sub-series within the central world - so you may find one thread more interesting than others. The books specifically in the series of Death are especially funny to me (
https://www.goodreads.com/series/109516-death), so at the very least enjoy the silliness of Mort.
IMHO the Discworld doesn't really hit its stride until
Mort or
Sourcery. The Death books are also favourites of mine, especially when Susan is featured. I love the Moist von Lipwig books though, he's just such a slippery bastard, and the Patrician is amazing in them. I didn't get very far into
Raising Steam, though; I found it so upsetting. It was obvious that Pratchett was focused in getting as many books finished as he could before he died, and
Raising Steam was the product of Pratchett's writing assistant and Pratchett's deteriorating brain. I just couldn't see the old Sir Terry in those pages. I ended up giving my copy to my father, I couldn't bear the sight of it. I've been reading and rereading all of Pratchett's works since I was twelve, and when Sir Terry died I felt like I'd lost a close personal friend that I'd had for decades.
I don't know how big of an industry this is, but
consoomer Bibles seem especially cursed:
I can understand wanting to present the word of God in a beautiful fashion, but calling yourself "Humble Lamb" when your cheapest option starts at 130$ is a bit much.
I suspect that at least some buyers aren't consoomers so much as they're after heirlooms or meaningful gifts for their family. The name 'Humble Lamb', however, is probably on of the most cynical marketing strategies I've come across for a ways.
Man, I recently finished Heffer's book on grammar. I bought it for two quid and it turned out to be signed by him. I also have Age of Decadence which I used for my dissertation.
A few years back I picked up the first three
Dexter books by Jeff Lindsay in an op shop. Got them home and discovered that they were all signed, so that was a nice bonus. They were much reprinted paperbacks, however, and this was also past the
Dexter heyday, so unfortunately they weren't worth anything. But it was definitely a, "Oh wow!" moment. It was one of those times where I wished I could be more of a fan of something so I could appreciate it properly.