This is a brand new introduction. I don't think any retailers even have it yet.
I've been keeping my eye out for it and see that 'Southern Living Plant Collection' has added it to their website.
The wholesaler, Flowerwood, grows out plants from that collection and is in our area. Find out what retail garden centers (not big box, but places that will actually special order something for you) buy from them and from which location. Keep an eye out on their availability list so you can know when to remind your local garden center about ordering.
You can't order from Flowerwood unless you are a retailer, landscaper or similar business.
For mail order, Flowers by the Sea may possibly have it in the future and sends great plants. Kermit, @fbts
, do you happen to be trialing this one? Thanks!