Hello. Nice collectible, but not worth too much. There are two on right now:
http://cgi.ebay.com/CIRCUS-CIRCUS-CASINO-1-NCV-CHIP-LAS-VEGAS-/160542995295?pt=LH_DefaultDomain_0&hash=item25611bb35f
http://cgi.ebay.com/1-Circus-Circus-WIN-CARDS-Red-Hot-Stamped-Chip-/130482811571?pt=LH_DefaultDomain_0&hash=item1e6161b2b3
99¢ and 50¢ with no bidders. I would just hang on to it.
on 
right now:
