Ooh, great question! Unfortunately, looking at these, nearly all of them were from the library. (A lot of them as audiobooks. I listen to a terrifying number of audiobooks these days.) But I do own all the Sayers books (whole series + the short stories omnibus). And in general, I certainly have lots of books on my shelves, if you want to borrow some! We can chat about details offline sometime. And I think the library's audiobook collection is pretty great, though I don't remember if you're an audiobook person. And/or tell me the kinds of things you're looking for, and I'll see what I can source... (Can you tell you've activated my librarian instinct??)