Jim, here is a link to one on ebay right now. Seems alot higher than what I've seen them go for before. Hope it helps
http://cgi.ebay.com/Sands-Hotel-Las-Vegas-25-00-Chip-999-Silver-Proof-Coin_W0QQitemZ200104195812QQihZ010QQcategoryZ63754QQtcZphotoQQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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