I bought a large book of pictures of small towns in my home state for use as a gift to the first family I'm visiting. The book cost $35; with their discount card, it cost $32. I liked it enough that I asked if they had a second copy, so I could give it to another family, but they said no. So I came home and looked on Amazon.
Free shipping because I have the Amazon Prime membership, which costs the same as the bookstore discount card.
And that's why brick and mortar bookstores are in trouble.