Good source for insulated fire bricks IFB

I needed to repair and alter my electric burn out oven as discussed on another forum thread. I ordered these insulated fire bricks on Amazon from SIMOND STORE. 9 bricks plus some mortar for $74. They came supper fast and most importantly were expertly packed with styro foam between each and every brick. Not a single one was broken. The last order I made was with a different company and 1/3 of the bricks arrived broken or damaged. I am very pleased and would order again from this firm.