I e-mailed this dealer about a year ago, and he told me he had acquired 138 of the $1 Riverboat chips. Until then the consensus was that the $1 chip from that casino was more scarce than the $5, but obviously that's not the case any more.

He has been selling them individually for a long time. And if you'll notice, he charges $4.50 for first-class shipping. You probably can find it cheaper elsewhere.