dear Red
i live in London.
do you just want to buy or are you happy to look at collections- ?
we might meet if you like.Let me know.
there are some regular antique markets, and special fairs and events, and there are always lots of beads of oriental origins such as shown in my recent book- in the chapters showing beads from china, japan, Hong kong, india, Java, Afghanistan, and Himalayan area.
mostly they are either sold at auction for very high prices, or by general dealers who may not be dishonest or knowledgable about the material, the craftsmanship, the value or cannot tell if something is a fake.