Bulk flour goes for around $0.40/pound and you can make a large pizza with around 8 oz of flour, so the flour is $0.20.
You can probably make six hundred pizzas with $6.00 of Sam’s Club yeast. So add one penny.
A 100-oz can of crushed tomatoes goes for $2.50, and yields four jars of sauce. One jar of sauce makes six pizzas, so the tomatoes cost $0.10. Double the cost to account for oil and spices. So the sauce costs $0.20.
Five pounds of cheese costs $12, and one half of one pound is plenty for a traditional cheesy pizza. So the cheese costs $1.20.
Three pounds of pepperoni, or 720 slices, costs $12. The pizza is cut into six slices, and I’d argue that three slices of pepperoni is appropriate per slice, so that is 18 slices per pizza, at a cost of $0.30.
The energy is free is you have a brick oven and trees. So, the grand total for our cheesy pepperoni pizza is $1.91*. If the economy was not in a free fall, I would open up a pizzeria and sell these pizzas for $14. They are very good.
*Update: The pepperoni actually costs $8.86, not $12, lowering the pepperoni cost to $0.20 and the pizza cost to $1.81!