Car Battery

I have been checking around for a new battery and it is unbelievable the difference in price for a good battery. I don't mean any old cheap battery but a good one with a good warranty. I have found I can get the same battery installed for $85, $95 and $159. Now that is ridiculous. Now where do you think I am going to go to get that battery. Three guesses and like they say, the first two don't count.