maybe Chris & Tony of "let's talk plants" & the "Tiny Jungle " still have some, I remember they have tons of besseae and phrags from OZ.
They are Slippertalk members too
I have a couple left that I bought from Popow in Germany...I don´t know if he has any left, but he has offered some recently on his Ebay, and I think there is some right now at a fair price...The link to the Ebay page: https://www.ebay.ie/sch/popow-orchids/m.html