Man, I don't think there are any either. I just flew up to Philly on business, and because of recent events, I didn't pack any sort of blade. Figured I'd just buy a cheap knife here, and mail it back to myself via post.
No knife stores that I can see. Looked in the yellow pages. I even went to K-Mart, where I've always found at least a Gerber, Uncle Henry, Old-Timer, etc.
Nothing. Not a knife in sight. Really a strange feeling. Back home, you can't sneeze without hitting a store that sells knives of some sort.