It isn't a big card shop but there is one at 4312 Division Highway(route 322) in Blue Ball,PA. From what I remember, there aren't any prewar cards. They are only open Wed. and Fri. 6:00-8:00pm and Sat. 10:00-3:00pm. 1-717-354-5900 There is also Mt. Penn Sports Cards 2252 Perkiomen Ave. Reading,PA 1-610-779-5282. I have never been there. There is a large shop at Fairgrounds Square Mall in Reading,PA 1-610-921-3160. I was only in recently to buy some supplies and didn't have time to look around. Also there is one at Park City Mall in Lancaster,PA. Here is the website.
http://www.bobssports.net/