This makes me think of Little Caesars pizza. They have a variety of pizza-place-type of stuff on their menus (hot wings, breadsticks, etc), but I wouldn't be surprised to find if 90% or more of their business was their $5.00 14-inch pepperoni pizza.

Around here (midwest USA), during prime pizza-buying hours, they set up a card table outside stacked with dozens of pizzas and people just drive by with a $5 bill out and grab a pizza.