Aquarium Center in Lindenwold, NJ has them for $1.89 on a fairly regular basis. Just google and call them up to verify they're in stock. Maybe a 40min drive from south Philly? The store has some rarer freshwater fish that you won't find at most LFS and a good selection of freshwater plants. Their saltwater selection is pretty good, too.
If you don't want to drive, though, I would highly recommend getting them shipped from msjinkzd. Her stock are the healthiest I've seen. In my tank they usually outgrow any other Amanos I've bought from anywhere else and get quite big.