Always get mine from churches
The best I’ve had for some time was an Orthodox Church in OPs home area
St Vladimir in Ambridge.
They only make them before Easter that I know of, and have sales on Fridays then.
But I don’t work out that way anymore, so haven’t been able to support them for a couple years.
There is a small Ukrainian Orthodox church In Slickville, where My grandparents lived. They had excellent ones years ago. But all the babushkas who really knew how to make them are long gone now, too.
I’ve never tried any from the specialty pierogi shops In the Pgh area. None convenient to where I live
So other than the shops that will ship them out, look up local Ukrainian/Russian orthodox churches In your area. Although these churches are gaining others who have bailed from the Roman Catholic Churches - a little. Many are just dying off as most who belong to them are older.