Campaign email says "For a Limited Time Only".
Advantage of Downpour is that their audiobooks are stored as non-secure MP3, so, I wouldn't buy physical, however, courses for horses…
Downpour (Audiobooks) - 50% off All CDs (Incl. MP3 CDs)
60
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You can get one month free membership at downpour using the code FIRSTDP this gives you one credit which you can use on any book. Make sure you cancel before the month end or they will charge you for an ongoing membership at $12.99. This code worked on my account even though I had had a previous membership.
Note Downpour restrict their library based on your IP address so I tend to use a vpn when purchasing from them.