We found ours in the most unlikely of places a few years ago. In one of those family run nurseries, the sort that you could pass by and not even realise what it was as there wasn't a sign outside displaying a name or advertising it as a retail outlet. We had known it for many years but hadn't visited for a very long time when, about 3/4 years ago, we decided to take along some members of a gardening group we are involved with. We hadn't realised that since our last visit the husband had passed away and the wife was struggling to carry on while trying to run down the business and close it up. While looking around we spotted this plant that we hadn't come across before. Out of curiosity we bought one and it prospered. We also tried cuttings from it and 3 survived.
I have to admit that these are the sort of nurseries that I like. The flashy, showy ones are sometimes just that, all flash and show, no substance, but these little ones often have real gems tucked away in corners.