As an educated guess on the price of the Firestones, the price is based upon the demand. If there were a million of these Tri-Ribs being sold annually, the cost of production would drop dramatically. But since the 16 x 6.50 x 8 is a "limited" market, the cost of production is up.
I don't know this for sure, but I am guessing the Firestones are USA made while I suspect the other brand mentioned is foreign made.
As for me, when I get ready, I will being buying the Firestones.