Each of us have our own sources. I have a couple of very good growers within 15 minutes of me and I make trips to Apopka, Florida, where there are a ton of greenhouses, growers and distributors. I just went on a day trip with my orchid club and found even more sources within an hour's drive. Some buy on line but there are too many places close to me to do much of that. Also, there are orchid vendors at all of the garden shows and sales here.
Jim