They do periodically have a limited edition runs of an existing scent made in the donkey milk formula. Check the "up next" on their website for the special edition release dates.
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It's difficult to name favorites, as I have nearly all of his donkey milk soaps and enjoy them all. Perhaps my favorite is an LE soap that he did with Chatillon Lux called Yuzu/Rose/Patchouli. It's one of the few soaps that I use sparingly, not wanting to use it up, and I've stocked up on the A/S. King of Oud and Fougère Bouquet are probably favorites, but Chypre Rose Concerto, Man From Mayfair, and Washington's Blend are close behind. I do enjoy his other scents, and use them all in my rotation. The Wholly Kaw soap base is excellent, and now that most are available with donkey milk, excellent has become outstanding, IMO.