As Ron and Dutch already said I buy Walmart batteries for the MH and Tow car because they are all over the US. Twice I replaced my starting battery for free under a 5 year warranty, once I replaced it in a Walmart parking lot while overnighting there. Having said that when I replaced the battery in my wife's car I found that Costco was $69 for the battery and Walmart was $101 so I bought Costco. I don't think it makes any difference as far as quality only convenience to stores when under warranty.