Local Sources
Collectible coins often net the best value from local sources composed of coin collecting clubs and hobby shops, which are staffed by knowledgeable enthusiasts dedicated to the hobby. Most coin shops can be located in a local phone directory, but clubs can be harder to track down. The American Numismatic Association keeps a list of official coin clubs where you can meet with other interested members and swap or sell your collection. Call ahead and inquire into the rules of any clubs you plan to visit, as some may have house rules regarding the sale of coins, including certification or written appraisals.
Secondhand Shops
One often overlooked option is secondhand stores such as pawn shops or flea markets that collectors are likely to frequent looking for a good deal. While your return may be lower, you will be paid up front and quickly once your coins' value has been assessed. Secondhand stores are very likely to have either a coin collector's handbook or a specialist on hand to appraise your coins. Don't be discouraged if the first shop you visit won't accept coins; pawn shops and similar locations know their clientele, and while one may not have any collectors, another may have a strong interest.
Online Options
Selling coins online is risky, as there can be a certain amount of trepidation on the parts of all parties. Without a face-to-face interaction, many collectors are reasonably wary of the potential for counterfeit coins or sellers who do not fulfill the delivery requirements. Websites such as eBay and American Coin provide additional information such as pricing assistance with their sales channels. They will often act as intermediaries to ensure that a sale takes place and that items are as advertised. Always remember insurance when shipping small, valuable items, as the risk of damage or loss while shipping is often much greater than the cost of this coverage.