JudaicaHQ lists 2 published Judaica merchants with a storefront in Pennsylvania. Every listing shows where its facts come from; affiliate status never changes the order.
Family-run Judaica and jewelry store on Bala Avenue in Bala Cynwyd, PA, serving Philadelphia for 30+ years: tallitot, menorahs, kiddush cups, challah and seder plates, ketubahs, books, mezuzahs, candlesticks, art and jewelry, with customized tallit and special orders.
Rabbi Yonah Gross's STaM business in Wynnewood (Lower Merion), PA selling mezuzot with certified klafim (installation and checking) and tefillin from $620, with checking and repair using loaners; megillot and sifrei Torah on request. Serves Greater Philadelphia, eastern PA, South Jersey and Delaware and ships worldwide.