I found a resource for folks in the Chicagoland area for tomatoes and Olive Oil.
Caputo's Fresh Markethttp://caputomarkets.com/
They have regular groceries and a mix of Mexican and Italian staples. A very nice clean store.
They have a large selection of tomatoes.
They also have the largest selection of Olive Oil I have ever seen. I picked up 3lb. of colavita.
Pomi in the carton
Cento Italian Tomatoes
7/11 tomatoes in the 6lb. can
Several other brands of San Marzano I have not heard of
They carry a wide selection of fresh Mozzarella, although the prices on cheese were not that good.