We borrow A LOT of talking books from the library. We seem to be able to order them online from about 4 counties' library stock and they turn up within a few weeks at our branch for free.
DD is 8 (and has quite boyish tastes in literature).
I/we find it quite tricky to listen to "full cast" versus "single narrator" stories in the car (it must be something to do with adjusting to one voice/sound levels, though we see to be fine with R4 plays). We'll have to look out for the Hobbit by Jackanory,, albeit abbreviated.
David Tennant is fab reading the Cressida Cowell HTTYD books.
Have "you" read any of Antony Horowitz's Alex Rider series? DH and I grumble about the plausibility, but enjoy these recordings. (Charlie Higson's Young James Bond seem a bit too complicated for DD at the moment).
David Walliams has also narrated most of his books.
Enid Blyton' s Famous Five series (Jan Francis) are also quite fun/lighter.
It took a while for me to get used to the voice, but Andy Stanton's Mr Gum books have grown on me.
It is worth sneaking in a few classics from time to time; I really enjoyed 101 Dalmatians on a recent car journey.
DD also gets car sick. We've found that putting her in the middle of the back seat, so she doesn't stare at head restraints, helps her enormously.