Librivox: The Collected Works of St. Patrick(translated by Cecil Frances Alexander). Includes his letter to Coroticus, his Confessio, and “The Deer’s Cry”, the beautiful “breastplate” prayer (lorica) ascribed to him.
The Dead White Guys podcast (sadly deceased, but still a good source of free audiobooks) includes a three-part reading of the Confessio.
Tantor Media has a non-free audiobook of Philip Freeman’s bio, St Patrick of Ireland. Don’t know anything about the book, but Tantor does some very good readings.
Maria Lectrix 