Last time, I asked them to check the price. It came up one cent, but the "manager" said he'd sell it to me for 4.99 if I wanted it. Since I already had one, I passed.
Tonight, I was looking for something else, and while there I found an old Haynes in the rack. This time, I just walked up to the cashier, and when the total came up, I held out a penny. He gave me a receipt and that was that!
I like the Haynes manual even at full price, but for a penny it can't be beat.

Now I have a copy to keep with the car.