I recently started buying pizza at "pick up pizza" (really the back entrance to Shelly's kitchen) in Lkwd. $10 a pie, and it's the freshest you'll get - they make it on the spot, not just reheat an old pie. Since it's so fresh, it does better frozen and reheated than others.
I also agree that somehow the Amnon's frozen pizza from Costco is better than the ones from local supermarkets