There is one just south of you in reading.
TCO Fly Shop
2229 Penn. Ave.
West Lawn, Pa 19609
(610)678-1899
There is also one just up the road from the Orvis shop called:
One stop fishermens Shop
Rt.611 4 miles north of Doylestown
(215)766-8000
They claim to have a huge selection of flies and materials. I never been there myself so I couldn't tell you. Heck your like 30 or 40 miles away from Cabelas in Hamburg Just take 78 west to 61 north, you can't miss it! I know they have a Good selection of flies and materials there.
Hope this helps a little. Good luck!