I've seen it at Albertson's in the produce dept. They had all types of pastes in tubes, not just tomato paste. It was quite costly. I, myself, would open 1 can of tomato paste & make 1 tablespoon dollops of it on a wax paper lined plate & freeze. When completely frozen, peel off the frozen sauce off the wax paper & put in a freezer bag (mark it, on the outside: tomato paste for recipes). As you're cooking, take out the needed amount, out of the bag. This would be more cost effective than paying $3.99 or more for a tube. Happy Times in the Kitchen!
It's usually near the canned tomatoes aisle, but ask the store manager - you may be surprised at where they tucked it. At one grocery they kept it next to the anchovies in a tube in the fish section.
Since you've already gotten some replies, and since this is a thrifty site...if you want to buy it in a tube so you can use small amounts and store it longer, you can always freeze partial contents of a can in a small baggie. I think it might cost less this way.
I heard Rachael Ray say that you can buy it at any store, I have seen it at Martin's store by the veggies in tubes of tomato paste and other pastes in a tube:-) Hope this helps.
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