Soda King is a fine retail establishment dedicated entirely to the selling of soft drinks, and is presumably the one and only place the brothers have for purchasing Root Beer (Blik refers to it as "The Root Beer Store".) The store is open 24 hours, offering a variety of different soda flavors for consumption throughout the day.
We first see Gordon, Waffle and Mr. Blik at Soda King in hopes of replenishing their root beer supply, only to learn that their neighbor, Kimberly had bought every last crate. Another visit of theirs involved Blik using his newfound power of static magnetism to construct a giant man out of root beer cans. Loyal customers, wouldn't you say?