Pizza Express pizzas are on offer in Sainsburys - 2 for £5 (normally £3.85 each). To top it off, I just opened the box and there was a 2 for 1 voucher inside, valid at any Pizza Express restaurant throughout January 2008. Nearly threw the box away before I'd found it! There's no mention of the offer on the box, but the expiry date of this pizza is 16/12/07.
Also available online.