It doesn't get much cheaper or much better when it comes to pretzels! And what else ot expect in Philadelphia? They sell pretzels, and nothing else other than condiments. They make them in the same room you buy them in, and you can see them coming out of the oven-machine. 3 for $1, 8 for $2, damn good and always fresh, soft and warm.
The hours are tough if you don't work in center city (i think they are 9-4 m-f).