I went to the first Sunday of every month coin show held at the Schaumburg, IL Embassay Suites sponsored by NOISE. It was nothing besides the usual. Vendors set up booths and sold their mainly numismatic coins at regular retail prices. Silver and gold bullion was sold at the regular premiums. The lowest price I got quoted for a generic silver 1 oz round was about $1.50 over spot. In other words, the usual price.
Overall, not worth going to if you have a local favorite coin shop that you go to. For better deals on silver bullion I would go to the Chicago International Coin Fair. This year's show will be held April 18-21, 2013 at the Crown Plaza Hotel near O'Hare Airport. In the past, I have bought generic silver rounds at spot price. That is the cheapest source I have seen.