NDAD stands for North Dakota Association for the Disabled, Inc. They run charity casinos in several locations in North Dakota. NDAD chips are listed in John Kallman's North Dakota guide, but not with these nice HOURGLASS mold. Sorry no traders.

John Kallman's Guide to North Dakota Charity Casino Chips
http://cashcoinconnection.com/Casino/USA/ND/NorthDakota.html