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The price of a good quality firebrick is currently around $2.45+ each. Red clay brick.
Also question is, what is the cost of firebrick?
A typical firebrick measures 9″x4. 5″x2. 5″, weighs about 8 pounds and is yellow. The price of a good quality firebrick is currently around $2.45+ each.
Just so, what can I use instead of firebrick?
Some alternatives do exist, such as sandstone and soapstone. Refractory concrete is another great heat deterrent as are old red clay bricks. Any of these can be used in place of the firebrick, to warm hearth and home.
Fire Clay Brick-23A - The Home Depot.