Jimmy "Snarf" Seidel may be best known for his growing chain of Snarf's Sandwiches shops, but since debuting Snarfburger in Boulder in 2013, he's been perfecting the old-school burger-shack vibes. All three locations excel at serving up supremely satisfying, totally customizable burgers at a super-affordable price: A double fully loaded with all the basics is just $7.75. Or you can up the ante with an array of specialty burgers topped with everything from crispy onion rings and sautéed mushrooms to fried bologna. Tots and gluten-free buns were also recently added to the lineup.