Protip: do not go to Costco in Hawaii. Do not even enter the parking lot. Shit is crazy. Unless you are on a tight budget and have a huge family to feed, dealing with the crowds is not worth the savings.
Discussion
But the gas may be worth it
I didn’t check, but the line for that is probably crazy too. I don’t even check the price of gas when I fill up in Hawaii. I just go to somewhere along my route that doesn’t have a line.
Try Costco in Japan. You need to wait in line to park your car for 20 to 30 minutes minimum. Then wait in another line to actually enter the store.