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There are over 130,000 audiobooks available on Audible. That selection includes a surprisingly small amount of crap, because recording an audiobook to Audible's standards is relatively expensive.
The basic subscription is £7.99 a month, which gives you a credit to download one new audiobook per month. You can keep that audiobook forever and unused credits do roll over to the next month. It's not cheap, but it's reasonably good value. They have a very generous returns policy - if you don't like a book, you can get your credit back and choose another one, no questions asked.
If you're on a very tight budget, you might want to check out your local library. For the benefit of blind people, libraries tend to have a good selection of audiobooks, although you'll need to rip them from CD. Most libraries also have an online collection of e-books and audiobooks that you can borrow using the Libby app, but the selection is usually limited to a small number of popular titles. You just download the app and log in using your library card number.
Or you could just torrent stuff.