Unfortunately, most of the tomatoes available even in gourmet stores are grown in Mexico, and that even includes the heirloom variety. I will not eat any produce grown in Mexico, so I often have to settle for canned Italian tomatoes.
The best source of tomatoes for me is weekly farmer’s markets. I especially like to buy Japanese tomatoes when they are available. These are not as red as the usual tomatoes—they’re more pink. However, they are very flavorful.
Momotaro. Truly one of the most delicious tomatoes you'll ever eat.