Haven't got a favorite source for tomato seeds. We actually buy u-pick tomatoes for $7.00 a 5 gallon bucket. I do have some san marzano seeds and am looking for more san marzano seeds as I will be breeding for fruit size, productive vines, and taste. I'm outside Chattanooga Tn. so anyone with seeds acclimated to our zone. I'd like some. Thanks, Show