Best burger in Vegas hands down! Badger Cafe is connected to the Rum Runner, so you can eat in the bar and get 24 oz. beers for only $4.50
You build your own 1/2 pound burger for $3.99 and it is AWESOME!! I would highly suggest getting their wings. They are just as good as the burger. They have around 12 different sauces and a flavor of the month.
The staff here is great and you will want to go back. They make you feel like they have known you for years.