I picked one up for $1.49.
The cake is roughly the same size as your typical cupcake although thankfully with less frosting.
The frosting was suitably thick, creamy, and, as is typical of a lot of cream cheese frosting, very sweet.
Nutritional Info - Popeyes Red Velvet Cake (80g)
Calories - 310 (from Fat - 130)
Fat - 14g (Saturated Fat - 8g)
Sodium - 220mg
Carbs - 42g (Sugars - 30g)
Protein - 3g