Frank, I just remembered I didn't answer your question about who in South America makes things that pass as Murano. I believe that ICET is in Venezuela. Brazil also has shops that make glass that looks a lot like Murano. I guess I should also mention Mexico and the USA in North America -- we see a lot of their "Murano" on eBay. Some of the work is very good; it just isn't Italian. (Many of the modern Mexican pieces from Juarez are beautiful, so should be collectible in their own right.)
Anita