I got one for $4.79.
This burger is forever associated in my mind with this hilarious introductory commercial featuring a focus group for the meat and cheese crowd ("I like the meat and cheese part. But why a bun?"). It looks like they added some sauces to the mix since back then.
The cheese is too mild to be distinguished but is well melted and provides a creamy base.
I feel like someone out there must think I really like mustard because like with the recent Lil' Doggies from Sonic, there was a lot of yellow mustard on my burger, followed by a little bit of ketchup and even less mayo (usually it's the other way around). I couldn't even taste the ketchup and mayo, but I got a distinct tang and mustard quality from the typically mild sauce. I think mustard is fine (although my tastes run more towards the more horseradish-y varieties), but it was a bit much.
Nutritional Info - Jack in the Box Ultimate Cheeseburger (266g)
Calories - 819 (from Fat - 445)
Fat - 49g (Saturated Fat - 21g)
Sodium - 1783mg
Carbs - 44g (Sugar - 7g)
Protein - 50g