As for buying I recently won chips in Saito's auction and bought from Spragg's last posting.
After 26 years there isn't much I need. I will trade if need be.

It is hard to sell a single or inexpensive chip with today's postal rates, E Bay fees, etc.

I have been having luck selling in the couple FB groups I belong to.

In the old days we had round robins which is now a thing of the past. Postage and a few bad apples ruined that.

See You Sunday,
Barry