When I first started collecting around 1990 or so, Dolloff Sports Cards had a brick and mortar store on route 1 in Portsmouth NH. From what I recall he had mostly pre-war cards. I had just started collecting the new over produced cards. I wish I had known better.
He had a sign posted in his store where he would charge for his time if you had any questions about what he had for sale. Or vintage cards in general. He charged $1.00 a minute. I only know of 3 or 4 stores around Boston now.