I agree with NHBandit! Although many folks do, you would never really want to sell your' coins at a Coin Show unless you have an extremely rare coin and you know that a Collector or Dealer at the Coin Show will pay a fair price or premium to obtain it. Coin Show Vendors (Coin Dealers, Silver Buyers, Grading Services companies, etc.) at the bigger Coin Shows, pay anywhere from $100 to $500 a table and most of them get 4 or more tables per Coin Show and some even have up to 10 tables. At these rates, a Coin Dealer cannot pay much for any coin or coins as they need to recoup some of the costs. Sometimes, you will find some folks locally that collect coins and will pay a fair price for them. However, from newspapers and Craigslist Ads, you will see that there are many folks out there that take advantage of other's misfortune and/or ignorance. Stay away from these folks as they want to purchase Semi-Key, Key Date and other valuable Silver coins that may be worth hundreds or even thousands of dollars each at prices based on Silver Spot. Ebay is probably your best bet but even then, it is not guarateed. Research what you are selling and the best way to present it/them on eBay in an Auction, then list the coin or coins the cheapest way possible on eBay to keep the fees that you have to pay at a minimum. eBay allows a lot of pics nowadays for free, so use them to really show of the coin or coins and write a great item description for the coin or coins. Really talk it up (actually write it up) but just don't lie about what you are selling. Be honest and don't stretch the truth and you should do well.
Frank