AF Boyers in Slatington isn’t far from Allentown and usually worth a visit.
https://www.afboyer.com/
Edit add on; don’t forget to go in the back room where the good stuff is. Also, check out the mounts, including a full size giraffe. Plus every time I’ve been there recently they have had 9mm, but a 2 box limit.
^^^A bit late for feedback, but this place was worth the trip. Thanks for the suggestion! Short on ammo the day I was there, but nice selection of firearms on hand.