I got a 16 inch diameter 1 inch thick plate glass blank
from Tim Walters in Georgia last year. This is good one.
Tim says no bubbles or imperfections and I can't see any.
Since then events have gotten in the way of a big scope
So I'll sell it for what it cost me - $125 plus actual shipping costs on 25 lbs.
I prefer FedEx (they now have ground service) as UPS is allergic to glass lately.
I can accept PayPal for payment.