I also remembered back then that I would look up phone numbers in the directory and literally call every single comic book/collectible store in my area to ask if they had a particular issue available (these were silver age keys). One of them was a DD 7 which I bought off a local shop. When I asked them over the phone how much, they responded that they don't give prices over the phone and for me to go down to the shop and ask about it. I pleaded that it was somewhat far of a drive and if they could just do me this one time with the price. They caved in and said $60.
When I got to the store, I told em I was the same person who called about it. Looked at the book and I told them I will buy it. When I came up to the register, they said the price is $80. I questioned them and asked why the bump up in price, you told me $60 over the phone. I don't quite remember what the guy said back but I bought it anyways.