I went to the Costco fontana store to buy a new car battery for my sons Honda Accord. I even brought with me his old battery so I would not incur a "core" charge. When I went to the check-out line I was confused to learn that the clerk automatically added a 9.00 core charge to the cost of the battery- I was then charged 8.75 % sales tax on the total amount. When I started to question the clerk- she said that I would be refunded the core charge by stopping by the member services counter when exiting the store. After waiting in line... read full review »