The tomatoes are only sold in cans, either whole or in fillets, so jarred tomatoes or those that are labeled “puree,” “chopped,” “diced,” “sauce,” or “organic” are fraudulent. Reply TrishUntrapped Jul 11, 2015 08:07 AM re: tomatoman1234 Tomatoman, Since I really do love San Marzanos and supporting the real deal, what brands do you recommend? Real San Marzano Tomatoes are a very old variety, extremely limited in quantity, grown and produced exclusively in the San Marzano region of Italy. San Marzano tomatoes are grown in the San Marzano sul Sarno region of Italy, which has a temperate climate and rich volcanic soil from Mount Vesuvius. In 2011, Edoardo Ruggiero, the president of Consorzio San Marzano, told the small Italian importing company Gustiamo that at maximum 5 percent of tomatoes sold in the U.S. as San Marzanos are real San Marzanos. BUY IT: Cento San Marzano Peeled Tomatoes, $4 from Target. Most of the major grocery stores will have San Marzano style or Italian style tomatoes at least, but few seem to have legit ones. GUSTAROSSO POMODORO S. MARZANO DELL'AGRO SARNESE-NOCERINO D.O.P. Gusti Blog offers a few tips from the Cosorzio San Marzano for identifying the real deal when buying San Marzano tomatoes. Where to Buy San Marzano Tomatoes. San Marzano seeds are available around the world, but the supply of real San Marzano tomatoes is limited. 4.99 a can for real San Marzano Tomatoes are 100% justified as they are a very expensive tomato to produce compared to the regular peeled Italian tomatoes that Cento is selling as "certified". Unlike faux Chanel bags, though, you can buy San Marzanos in legit stores, which is why the sheer number of knockoffs is jaw-dropping. Because production is so very limited, the Italian Government and the European Union have formed a way of protecting consumers from fraud by having San Marzano tomatoes tightly controlled. Finding the real deal at the grocery store is a bit of a challenge.