My local Jack in the Box offers them at $4.49 a piece. They also have a coupon on the Jack in the Box website for $1 off that doesn't expire until the end of July.
The beef patties sport a nice bit of browning and add a lot of meaty texture and taste to the burger. I could actually see the pepper on the patties.
The onion rings were pretty crunchy and had a delicate sweet onion flavor.
Jack's toasted sourdough is a favorite of mine. The crumb is always moist and buttery, while the crust maintains a thin crispy shell. On this occasion, the bread was even toastier than usual, which was real nice and the high point of the burger.
Nutritional Info - Jack in the Box Jack's Big Stack
Calories - 925 (from Fat - 546)
Fat - 61g (Saturated Fat - 22g)
Sodium - 2086mg
Carbs - 46g (Sugar - 6g)
Protein - 49g