It really depends on the size required. Once the correct size is determined, then the price is pretty much based on warranty. The better the replacement warranty.... the higher the price.
I just replaced a battery in one of my Ford vehicles at the dealer with a Motorcraft Battery. They charged 189.00 installed (a difficult installation due to battery location within the vehicle). I thought that was a fair price as other places had quoted 225-250 installed.
@Umile IKR.... That was one job I did not want to tackle myself as it involved removing a bunch of assemblies (the battery is actually up near the firewall, underneath the air cleaner assembly).