Help! Large rectangular pizzas - Where?

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As title really. Got a dozen 13 yo's for birthday tea on Saturday night after going to see a film. Am intending to do shop bought pizza, and don't want the boys to be waiting ages for more pizza to be cooked. Iand am sure I have seen large rectangular pizzas that pretty much fill an oven shelf in one of the supermarkets, but I cannot remember which one.

I've had a quick search on the major suoermarket websites, and found pepperoni only at Tesco, and nothing else. Anyone seen any in store recently?

All major suopermarkets nearby

TIA

Marks and spencer and tesco

Costco - but theybmight not fit in the oven, I had to cut mine up!

I remember co-op doing them, not sure if they still do.

Tescos do them :)

Yes, definitely M&S and not Asda, Sainsbury or Waitrose as I was looking for some last month and they didn't have any.

Ocado do some reasonably big ones, Costco do bigger ones.

thanks all, much appreciated