Kirkland auto batteries are not available online or in-store. Costco does not sell this line of battery anymore and replaced it with the Interstate brand.
Though discontinued, Costco still honors the warranties of its Kirkland batteries and replaces them with Interstate batteries. Interstate batteries are purchased online at InterstateBatteries.com.
When purchasing an automotive battery online, it's important to know what size the vehicle needs. The proper size is determined by the year, make and model of the vehicle. Interstate's website provides a catalog to help locate the proper size. Interstate also provides warranty information for batteries becoming inoperable during the active warranty period, as well as recycling information for old batteries.