Hi piper:
You do have a problem: You need a hi production oven, it must be electric and you wan to buy a used unit.
My suggestion would be to find a Middleby Marshall electric 250. It has a 32 inch belt and an 80 inch bake chamber. We placed a lot of that model in stadiums when pizza first became popular in those venues.
You should be able to bake about 70 pizzas per hour with that unit.
Patriot also makes a good suggestion; The problem, I think, would be finding a couple of the larger units fairly new. Our experience has been that parts for the older CTX ovens are very hard to find and very few of the newer models are on the used market as very few have been sold.
Further I think you would be better served by putting an oven in both your sales locations. The logistics of producing for two locations and transporting product to a satellite location could be overwhelming.
I do not think there many used electric MM 250 ovens available. If you decide to go the 250 way I have contact with most of the used dealers in the nation and could survey them to se if any of them have one. Or if you wish to go with the CTX I could do the same seeking that item for you.
George Mills