You could try OFE International in Florida. I've bought supplies from OFE in the past and had the items shipped via UPS ground right to my door. They've got wooden Vanda baskets in different sizes to choose from.
Link: http://www.ofe-intl.com/
Then, make them yourself. It's so easy....and cheap. Just go to a lumber store and get a piece of cedar, 1/2" or 5/8" x 8' long and cut it into 4", 5" or 6" lengths, or whatever size you want the basket to be.....and drill the holes in the ends and put it together. It's really easy to see how they go together just from looking at one or a photo of one.