Prior to this recent discovery, only 4 examples of this chip were known. This $25 is the only known chip recorded from Khoury's El Rancho Rio, which was open for a very short time only between 1949/50 on Hwy 91, Las Vegas.

96 chips were found, presumably being the balance of the original box. Of these, only 31 have visible hotstamps so those will be the only ones available.

You can order these here:
http://www.marlowcasinochips.com/obsolete/khourys.htm

I have a number of high end rarities still available on this page (all items have been added now):
http://www.marlowcasinochips.com/obsolete/obsoletehighend.htm
.

.