I bought two for $5. It's $3.99 if you get just one.
The ketchup was a little heavy and the lettuce was not very fresh and not so lively, but the tomatoes and onions were of good quality. The pickles were surprisingly plentiful (maybe too much so for some) with an even layer across the burger. Fortunately, they were mild with a nice, watery crunch to them.
If looking to consume less calories or carbs heading into the new year, you can also get it without the bun:
Nutritional Info - Burger King Flame Grilled Chicken Burger
Calories - 480 (from Fat - 225)
Fat - 25g (Saturated Fat - 2.5g)
Sodium - 1160mg
Carbs - 42g (Sugar - 10g)
Protein - 22g