If you use San Marzano tomatoes, I’m surprised you have trouble finding 35-oz cans. The places in San Francisco that carry real San Marzano often have 35-oz cans rather than 28. That size seems to be an Italian thing.
I buy San Marzano tomatoes at an Italian specialty market most often, and at one supermarket that has a good selection of imported Italian products. No 35-ounce cans — ever