If you end up enjoying Matilda, I'd recommend anything else by Roald Dahl. If the library doesn't have The Roald Dahl Audio Collection, then any or all of them individually - Charlie and the Chocolate Factory, James & the Giant Peach, Fantastic Mr. Fox, The Enormous Crocodile, and The Magic Finger.
Otherwise, or also, there's always the unintentionally hilarious, ridiculous, and terrible examples of mass-produced romance novels. With most of those, you have to really enjoy laughing at other people.