I have recently been buying some similar badges. I am putting together a shadowbox display (I have seven and am looking for two more). Most I have purchased for $20 or less but a couple cost me more.

I have bought 5 of them from a gentlemen named William O'Brien who indicated that he had been a member of the CCGTCC. He might be able to help you with a value as he specializes in Casino Security items. His email is WilliamBugsy@aol.com and he is currently auctioning items on Ebay.