Math Poser Part II: Deli sale offer

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This is part two of a math poser.

You have a sandwich shop. They offer subs, pizzas, and (oddly enough) whole watermelons.

Each of these food items comes in two sizes: the small (six inch), and the large (12 inch) sizes. With the watermelons its the radius of a perfectly spherical shaped watermelon.

Every now and then this deli has a sale in which they offer X number of the small size for the price of one of the large size.

My question is this: at what number of the small sized units for the price of one big unit does the offer become a "good deal"?

This time we will do the pizzas.

Check all quantities of small pizzas in which it is a good deal to buy them all for the price of one big one.

Explain your reasoning.