I just ordered 4 full chisel chains for my 346XP @ $9.99. For that price, it would never pay to take them and have sharpened. I do it all by hand or use a Grandberg jig but would never pay a saw shop. If they get rocked or hit a nail, pitch them.
I bought my Dolmar PS-510 at Rocky Hill Chainsaws on route 100 between Exton and Pottstown. I'm not sure how far you consider SE PA. This is northern Chester County. Owner has very fair prices, does any repair, though I've never needed any. Sharpens chain, carries supplies at better prices than Lowe's or TSC.
I don't think he has a web site, but he is listed on several local merchant sites. I think the mailing address is Glenmore.