You may wish try and buy from overseas. Every year many of the Thai growers visit the Taiwan International Orchid Show and I have seen them loading cartons of plants including many multiflorals. This show is held every March. I missed this year's show.
It is a small world. Kindly send my regards to Khun Chalit and his wife Siriporn. I hope one day we could meet up when I am visit CM again. I have covered a fair bit of the North East and North West of CM.