Earlier this year I recorded an audiobook of Roberd Sherard's second biography of Oscar Wilde for LibriVox, the home of free public domain audiobooks.
You can listen to and download The Life of Oscar Wilde on its LibriVox project page.
A few years ago I recorded the first of Sherard's Wilde bios, Oscar Wilde: The Story of an Unhappy Friendship, a much shorter book. You can still listen to Unhappy Friendship at LibriVox.
I will probably record the third biography by Sherard, The Real Oscar Wilde, at some point. Until then, you can find the full text on Archive.org.