Your best bet to find one easily is eBay or collectorcartrader.com, both of those will usually have one or two like you describe. Sometimes you can get really good buys on eBay, but there might be distance involved. The cheaper, more difficult way is to watch your local paper, Trader of Nickel Ads publications, etc. They don't show up very often, but you can often get one cheaper that way. Good luck!