Try the Gettysburg gun show this weekend. There is usually a mag dealer or two there which might have what your looking for.
Where is the Gettysburg gun show this weekend? I am looking for some "normal" Glock 9mm mags.
I started a thread about it here: https://www.mdshooters.com/showthread.php?t=254725
The promoter hasn't updated their page yet (still showing last week's Morgantown show as the 'current' event), but I expect it to be in the same place it has been held before, the event complex just south of Gettysburg.
Allstar Events Complex
2638 Emmitsburg Road
Gettysburg, PA 17325