While tan or “yellow” is the most prevalent color, Fire brick varies by region and it’s duty rating. All of the BrickWood Ovens models require a Low or Medium duty brick - it’s about 7lbs per brick and not very porous. It’s very solid and very heavy.
The price per fire brick should set you back $1.50 - $2.50 per brick. If it’s under $1.50, it may be a clay or cement brick, so make sure it says FIRE BRICK.
If it’s OVER $2.50 per brick, call around for the best price… $2.50 is getting up there.