Audiobooks.com is giving away a free audiobook as a download every day in June. I've missed the first few days, but today (June 9) is Around the World in 80 Days by Jules Verne, read by Jim Dale, an excellent narrator. The book itself is a great adventure; I've reviewed a LibriVox version here.
To get your free audiobook, download the Audiobooks.com iOS or Android app. Then, go to Booklists and Bestsellers to find the free book of the day. Download it and it's yours to keep!
If you haven't tried out Audiobooks.com before, you can also take advantage of a 30 day trial membership and download a free book. I recommend The Girl with All the Gifts by M.R. Carey, Cat's Cradle by Kurt Vonnegut, or the unabridged Simon Vance version of The Mauritius Command by Patrick O'Brien (the fourth book of the Aubrey-Maturin series, but a good starting point). I've listened to all of these as audiobooks and can confirm that they're great books and great performances.