I'm sure they thought about it, then realized that shipping from the fulfillment center to the bookstore wouldn't be all that cheaper than just doing home deliv

I'm sure they thought about it, then realized that shipping from the fulfillment center to the bookstore wouldn't be all that cheaper than just doing home delivery. They'd have to either use drones, or do constant runs from fulfillment centers to bookstores to make it significantly faster than the same-day / second-day delivery you already get with prime.