This sounds unlikely, but I found an absolutely great muffin place on 33rd and fifth. Probably not worth a detour, but if you're in the neighborhood, go to the Kosher place on the South East corner of 33rd and 5th. Their muffins cost only $1.00 and are always fresh and chock full of whatever gives them their name (e.g. the blueberry muffins actually have lots of blueberries, which is a rarity in this city and certainly in this culinarily challenged area).
Don't let looks deter you either - it looks like your run of the mill muffin peddler...but it's a lot better!