I paid $2.99 for one.
The Naked Chicken Chalupa is basically Taco Bell's take on boneless fried chicken but with familiar Taco Bell toppings. You can also consider it to be somewhat like a reverse chicken salad (heavy on the chicken and light on the salad) that you can pick up and eat.
The lettuce and tomatoes were a little sparse on my particular Naked Chicken Chalupa and I wouldn't recommend driving too far before you dig in--the heat from the chicken shell turned both the lettuce and tomatoes all wilted and mushy (but the cheese was nicely melted).
It's a shame they don't carry green onions at Taco Bell anymore as you could make a loaded chicken taco-type of deal by having them fill the chicken shell with sour cream, cheese, bacon, and green onions.
Nutritional Info - Taco Bell Naked Chicken Chalupa
Calories - 440 (from Fat - 270)
Fat - 30g (Saturated Fat - 7g)
Sodium - 1090mg
Carbs - 22g (Sugar - less than 1g)
Protein - 20g