Yes, so we end up back at Amazon. Which as far as I'm concerned is one of the biggest benefits of the internet revolution. I used to be a professional librarian and I haven't forgotten the misery of using BBIP (British Books In Print), which was a huge red hardback volume that came out every 6 months, listing every British book in print, with monthly updates in between. To find out whether a book was available you had to look up the latest volume plus all the updates, then check the publishers' catalogues in case it had gone out of print very recently, then order it from a bookseller, then wait till they told you whether they could get it or not. For forthcoming books you were dependent on The Bookseller, which you had to read every week in case you missed something, plus publishers' catalogues when they could be bothered sending them.
Now - you look it up on Amazon. If it's in print you order it, if not they will probably have it anyway via Amazon Marketplace, if not you check Abebooks. End of story. Brilliant. And one of the best things is that YOU look it up - BBIP used to be closely guarded by libraries and booksellers as one of the tools of their trade and it was not available to the public. Maybe I'm odd, but I far prefer looking things up myself to having to ask someone to do it for me.
And BTW there's no need to be snobbish about the likes of Dan Brown and Jeffrey Archer. I wish I could do what they can. I'd be a lot richer if I could. My attitude, having been a school librarian among other jobs in libraries, is that reading is better than not reading, and some people are only ever going to read the likes of Dan Brown or Danielle Steel or John Grisham. So what? They're reading continuous prose which is usually grammatical and properly-spelt at the very least, even if it's simple. If more people did that there might not be so many instances of confusion of their/there/they're, it's/its and you're/your (or should I say yuor). Dan Brown and Jeffrey Archer are complicated cf those easy readers they do for adults now (the ones that come in a cardboard display case, face out - usually a Dr Who story, a sportsman's bio, a couple of short stories by big-name authors like Val McDermid) - which shows that for some people it's an achievement to get through a full-length book. And good for them.
I'm not saying there is anything wrong with those books (well, two of them at least), but I wouldn't want them to be the only literature available. Now try being a small publisher willing to take a gamble on some unknown woman author writing about a school for young wizards. If you're lucky Amazon will take a handful of your books and if you're really, really lucky they'll pay you enough to cover your costs. Maybe you won't be so willing to take the gamble, and her book will remain unpublished. And book ordering has improved a bit since the days of BBIP, Amazon or no.