I found these at  a local grocery store.  Many were over 12 inches in length. 
 
Sweet Palermo derives its name from its sweet taste. The subtle sweetness ensures that this unique pointed pepper adds value to a wide variety of dishes. It's a sweet treat when eaten as a snack.
 
An independent panel compared the taste of Sweet Palermo with that of other types of pointed and bell peppers. The conclusion: Sweet Palermo is significantly different in terms of sweetness, bitterness, fruitiness, aroma and toughness of the skin. It is less bitter than other peppers. This unique vegetable is sweeter, juicier and has a more intense aroma. That aroma also contributes to the sweet taste.