They are not too difficult to find and they are usually very cheap (can be found for less than $20) as the numismatic value of them is rather compromised. They are sometimes very difficult to distinguish from a well circulated coin. Pictures on sites like ebay often lack the detail to positivly identify them but I have seen a number of souvenir examples that were mounted in jewelry bezels such as this.....

http://www.ebay.com/itm/Harrahs-Club-Reno-Lake-Tahoe-Key-Chain-Fob-1897-Morgan-Silver-Dollar-/371708047630?hash=item568b86b10e%3Ag%3A3ZUAAOSw6n5XrP0y&nma=true&si=5X%252BHpaQ8cRnT9i%252FrqaOBbpyscSA%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557