I am also a Costco battery person! Cheap to buy a huge stash of AA and AAA batteries at Costco. In fact, there is a Costco 3 blocks from me and I get all my gasoline there and batteries. I prefer some other TP, Costco is not such a great deal on the TP IMHO.
I did just order a HD camcorder from Costco, a nice bundle deal. I needed that for this summers Disneyland expedition