You guys get ripped off in the U.S. when it comes to pizza (and that's about the only thing). In Australia, Domino's and Pizza Hut compete viciously with coupons (everybody gets a set of coupons in the mail each week), so most people can buy unlimited large pizzas (pickup - delivery is a bit more expensive) for $5 each (and remembering the exchange rate, that's about $3.50 US) with practically unlimited toppings.

In Seattle, my friend ordered a Domino's cheese pizza and it cost $20 delivered. That's daylight robbery, I tell's ya!