Look at some of the rare items that Saharacoins sold on eBay this week:

Thought you had all the Circus Circus promo chips? Probably not this one (I don't).

http://www.ebay.com/itm/1-Circus-Circus-Free-Play-Las-Vegas-NV-Gaming-Chip-C96-/180953128123?pt=LH_DefaultDomain_0&hash=item2a21a59cbb

I don't think anyone has seen this dirty old Caesars Palace no-value chip before!

http://www.ebay.com/itm/Caesars-Palace-Grand-Prix-Las-Vegas-NV-Gaming-Chip-C24-/160865346321?pt=LH_DefaultDomain_0&hash=item2574526311

Scarce Caesars Palace $25.

http://www.ebay.com/itm/25-Caesars-Palace-Casino-Las-Vegas-NV-Gaming-Chip-C22-/160865343905?pt=LH_DefaultDomain_0&hash=item25745259a1

And several notched prototypes from a California cardroom:

http://www.ebay.com/itm/20-Rainbow-Gardena-California-Gaming-Chip-C16-/150879340674?pt=LH_DefaultDomain_0&hash=item23211c0882