Potbelly Sandwich Works on Southport is a great place to go if you're in the mood for an affordably-priced, delicious toasted sub. All subs are the same price and come in at under $5, with extra meat for 50 cents more. I hear they have great shakes, but I can never fit one in. They've got a fun, antique store feel and great, speedy service. And since you watch someone make your sub, it's hard for them to mess it up. Great subs!