Thanks for the help and reconendations!!
It looks like the Morgan bricks are out of stock until October. It's sounds like Mikey recommended the BXI Ceramic Fiber Thermal Insulation board with a couple coats of Plistex as the floor? Since I'll be doing Plistex in the forge anyway maybe that's not a bad direction to go??
Would it make sense to try to use the fire bricks that came with the Mr. Volcano as my back/front walls and see if I can get a coat or two of Plistex on those also?
Looks at like that board only comes 12x8 inches, my forge is 16 inches but I would think that would be plenty long enough for the floor?