I bought one for $2.69. It used to be available chainwide but is now listed as available in "select regions."
The sweetness was counter-balanced by the saltiness of the breaded chicken and the bits of bacon. The chicken was ground rather than a whole cut but was surprisingly thick, moist, and meaty. The breading was just lightly crisp and lightly seasoned.
The bacon was not so crisp and fairly mild. I
Overall, while far from perfect, White Castle's Chicken & Waffle Sliders hit the mark where it counts--the chicken and the waffle.
Nutritional Info - White Castle - Chicken & Waffle Slider (140g)
Calories - 480 (from Fat - 290)
Fat - 33g (Saturated Fat - 9g)
Sodium - 650mg
Carbs - 36g (Sugar - 14g)
Protein - 9g