Tonight I did it, I finally managed to buy some stuff at CostCo. In reality it's no big feat but compared to the disaster on Friday, it went quite well. It was still quite busy but nowhere near the madhouse that I experienced Friday.
This afternoon I came home from work a little early and I decided on the spur of the moment to head out and try it again. Naturally I took my son along for the ride and left the wife at home. I figured she could use a break. The drive took 25 minutes instead of over two hours like Friday, so that was a vast improvement. And I was able to get a parking spot on the roof quite quickly also.
Inside there were still quite a lot of people, but again, not as bad as Friday. Even while shopping, I can't stop thinking of blogging.

A selection of tea. As we can see there are two types of tea bags and loose leaf. There were others that wouldn't photograph as well on my SO903i. Penguin, this one is for you!

Though in true American style, the coffee section way outdid the tea section!

Here is what I ended up buying, nothing too exciting for people living in Australia or America. But for a guy like me living in Japan, being able to buy such basic products felt like a total luxury!
XXXX beer, 24x330ml cans ¥2998. DrPepper, 24x355ml cans ¥1038 (The casing doesn't have any soft core porn like the Japanese edition), Granola ¥1288 (The same like my friend bought for me), 5Pack of Pringles ¥858 (I forgot the ¥300 coupon), 25 pack of Shlick razor blades ¥998, National Geographic April 2008 ¥768, Bilingual Kids cardboard Truck & Car book ¥998.
Feel free to look up exchange rates and compare these prices to what's available in your country.

The view behind me before I went to the checkout. As you can see, still quite busy. But only 1-2 people lining up for the checkout.

The "FoodCourt" is a selection of Pizza slices, Chicken or Bologa bake, Clam chowder, Cesar Salad, Hot Dogs, Twist Churros or Ice Cream. Once again, nothing exciting but it's just different from what is usually available to me.
So with my Mission Accomplished, a cold can of XXXX in my stubby holder, and Pringles crumbs on the table I have been able to experience a little slice of American life in Japan.