Pizza prices nationally have a wide scale according to Priceonomics.com .

Here’s is more economic data of their price research:

How much will you pay for a large cheese pie? Median prices range from $7.25 to as much as $15. Despite only looking at plain cheese pizza, there are subtle stylistic differences that likely lead to price variation. The neighborhood family-friendly pizza place and the typical franchise have much lower prices than artisanal wood-fire pizzerias. Other regional differences, like Chicago deep dish, lead to higher prices as well.