I finally had a chance to obtain a cutting of Hoya collina in September of 2017 from AH Hoyas; at that time it was called Hoya biakensis. It was part of a disastrous order where 8 of the 12 plants that I ordered arrived dead. Hoya collina was just barely hanging on, but with a lot of TLC, I manage to save it from the brink. Considering the hell it put me through later on, it might have been better if it had not lived!