Amazon has select Kindle eBooks starting at $0.49. You may add the optional Audible Audiobook to each Kindle eBook purchase for $0.49 each.
Available titles:
The Richest Man in Babylon by George S. Clason
Kindle Edition $1.99 + Audible Audiobook $0.49
Edgar Allan Poe: Complete Tales & Poems
Kindle Edition $0.49 + Audible Audiobook $0.49