It is possible to buy both "Father Tim" novels by author Jan Karon that are currently released on audio book. There are several online retailers that offer the books, such as Amazon and Barnes & Noble.
The two most well-known online sellers that offer the "Father Tim" audiobooks are Amazon and Barnes & Noble. It may be expensive to find compact-disc copies of these audiobooks for a reasonable price as the supply of them is limited, as of 2015. The digital versions of these audiobooks can be had for much cheaper prices. There may also be copies of the CD-versions available at a local book store or library.