You wouldn’t sell your used car for whatever price the buyer offered to pay you for it, would you? You might check Kelley Blue Book® or NADA® to find the value of your car before negotiating a deal. Likewise, you can check the value of your coins before selling them to a coin dealer using these resources:
Lincoln Cent Resource: http://www.lincolncentresource.com/
World Coin Prices: http://www.ngccoin.com/price-guide/world/
Silver Coin Calculator: http://www.silvercoinstoday.com/silver-calculators/us-silver-coin-calculator/
Most Valuable Coins: http://cointrackers.com/blog/11/most-valuable-coins/
Know of other resources for finding coin values? Comment on this blog and share your knowledge with others.