Neapolitan pizza made with in house mozzarella and local tomatoes would have minimal cost no matter where you made it, your fuel and flour would be the largest expense. To me, the spirit of Neapolitan pizza is not using imported Italian ingredients that counts, it is the freshness and localness of the ingredients used, as well as the simplicity.
Here in Texas, that is not going to mean week old buffalo cheese that has 10,000 airline miles and canned tomatoes, it will be fresh mozzarella pulled daily, local Rockwell tomatoes prepared well, and a hot fire.