Educavision.com has a good list of books for intermediate learners. It would have been better if one could browse the first few pages of these books online before buying them. They have a very short list of Creole books.
Libreri Mapou in Miami, Fl has a great variety of books. The librerimapou.com website does not list everything in the store. You can spend hours browsing through the materials that Mr. Mapou has (front and back room of the store). If you're ever in Florida and plan to visit, call ahead and make sure that they know what time you'll be in - The posted operating store hours are not strictly observed.
In Haiti, you'll find some great books at Presses Nationales. You can visit their website http://www.pressesnationales.ht/, click on EDITIONS PNDH from the tab, then click on LES COLLECTIONS or OUVRAGES DISPONBLES for a list of their books.
a list of books I think would be great for intermediate Creole learners:
Lafanmi Bonplezi by Maude Heurtelou (novel)
Agasya by Emile Celestin-Megie (novel) (I find the font in this book distracting)
Bèbè Golgota by Pierre M. Chéry (novel)
Tonton Liben by Carrie Paultre (which you can buy from the university of Kansas)
Fòklò Peyi Dayiti book 1 and/or 2 by Bryant Freeman (folktales and jokes) (University of Kansas bookstore)
Istwa ak Kont Kreyòl by Maude Fontus or Mod Fontis in Creole (folktales)
and also Guy Regis' Creole translation of L'étranger by Albert Camus,
Etranje!
There are more... and I'm hoping that other people might add to this list thanks :)
Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words