I found the rose in Natchitoches, LA, this summer at a garden show. It had been rooted by someone in the Antique Rose Society and it was the only one left when I bought it. I first saw it listed for sale at the Antique Rose Emporium at Brenham, TX. It had a little history that said it was a found rose that had been discovered in Natchitoches. So you might try, The Antique Rose Emporium, Rt. 5, Box 143, Brenham, TX 77833. 409-836-9051 Hopefully, they still carry it. My catalogue is over 10 years old.
When my bush gets larger, I would be wiling to cuttings for rooting.