Every once and awhile, you get lucky.  I happened to check eBay a week ago to see what was new and low and behold, Gardino had listed a Hoya platycaulis plant in flower for sale, and miracle of miracles, it was a buy it now and not an auction. The price was $57 and while it was the most that I ever intentionally paid for a Hoya, I jumped on it. The plant arrived a week later with flowers still intact.