ALL stores that sell batteries have to take them off the shelf when they are on the shelf too long. These are brand new batteries that never sold. All you have to do is ask them.
Some will deny they do such a thing, note to self, never buy batteries from that store. Autozone, Advance, the Interstate battery store, they all have to rotate their stock and take brand new batteries off the shelf that have not sold. I used to be able to get batteries from Autozone like this for $50. It has gone up to somewhere around $60 here lately. I went to Advance, they have their "used" batteries usually sitting on the end of the counter. A couple of years ago they had two of the same type and I was looking for a matched set for my diesel. They had $70 each on them. I told the guy behind the counter I could get "used" batteries for $50 each across the street at Autozone, and he said ok and instantly took $20 off each battery. They are a little smaller than the stock battery, but like the other guys said, they crank the truck over fine in any weather.
If you go this route, you have to be creative and go with what they happen to have sitting there when you go to the store. Do not buy the batteries that have the terminals sunk down in a cavity in the battery, because you sometimes have to turn the battery around backwards if the + and - terminals are in the wrong position. I just bought a used battery from Autozone for a new acquisition, a 2002 f150. The battery fit fine except the terminals were backwards. So I had to flip the battery around, and then undo a clip holding one of the battery cables so it would reach to the other side. No biggie.