I know what the book numbers are, which was last printed in 2008. As per - Rare Issue with name on edge.
Only about 10 of the BACKUP chips are in collectors hands. The item "MGM Grand & Theme Park $1 Casino Chip BLUE Extremely Rare R-8" is in sale since Saturday, March 13, 2021.
This item is in the category "Collectibles\Casino\Chips\Individual Casino Chips\$1". The seller is "chippinndippin" and is located in Hightstown, New Jersey.This item can be shipped to United States.