Check out the bait shop thread at the top of the Ice Fishing PA forum. We started it last year so it should be pretty up to date. One of our members even created a map of the various shops so you can quickly look for one in your area or where you are fishing.
My son went to Sible’s in Laceyville last year. He said it was good and they do sell minnows/shiners. It may be a bit of a drive from Tunkhannock but it is an option.
If you can’t find anything in your area and are in a pinch, a pet store is always an option. They usually carry all types of creepy crawlies (worms, mealworms, butter worms, wax worms. etc.) and many will carry rosy reds. They’re small but are a good option for panfish and trout if there’s no other bait available.
Hope this helps!
