So which Montrose, Pa. do you live in: is it the one in Susquehanna County or the one down in Berks county? I am guessing that if it was the one in Berks County you could find some good places on your own being as close to Philly and Baltimore as you would be. As for the one up in Susquehanna County you might look toward Scranton, Pa. or Binghamton, NY.
From your initial post, I get the idea that maybe you are going to the shops just to look. If that is the case, why not give Clyde Peeling's Reptileland a try. It is located in Allenwood, Pa about 130 miles from either of the two towns. This is a definite warm weather stop, as it has quite a few outside enclosures for tortoises and some other animals. There are also inside enclosures for snakes and other herps. A really nice private zoo dedicated almost exclusively to herps. I have been there a few times and it is quite a trip for me. Never seen a sickly herp there. You may want to check with them to see if they sell herps to the public.
Reptileland
Sorry I could not be of more help about shops to visit; but I do hope the tip about Reptileland will turn out to be a good one for you.
Best regards,
Glenn B