Because nobody has even attempted to answer your question, I will try. Unfortunately your location is a handicap in itself. Secondly, Florida in the United States in a major center for these type coins due to it's fortunate location between South America and Spain where much of the available silver cobs are found due to sunken Spanish fleet ships transporting the cobs from the New World to the Europe. Therefore, some of the most reliable and knowledgeable dealers happen to be in Florida. Certainly not exclusively however. Affordable? What are you looking for exactly? Here is one:
