with necessity being the mother of invention, someone has found a way to compile real silver and gold prices. there is a wealth of information on these two pages, which list transactions on ebay. one of the columns in the middle of the page shows the premium to the phony comex price.
this looks like a work in progress, so we will probably see additions and/or more pages like this.
http://www.24hgold.com/english/buy_s...
http://www.24hgold.com/english/buy_s...