There is $100P available at Apache.
$2.75/chip, available in barrel quantity, and in Casino used condition. It's not the ideal way to get them, but they are available this way. If it's just a barrel or two to finish a set, it may be the solution.
But to answer the question, YES. Minty $100P, or even used for that matter, aren't coming for sale on the classifieds. Maybe a barrel or two last couple weeks.