Dr Oetker pizzas are currently £1.50 each in Asda too. I don't normally spend more than a quid on a pizza but these things are fucking gorgeous. They're VERY thin and crispy and taste fantastic. I got a Special (pepperoni, ham and mushroom), Pollo (chicken and spinach) and a new limited edition flavour (can't remember what it's called now but it's ham and red onion).
Tesco often do them for £1.50 each too.