Costco is great, we've got a new one in Bristol that is never packed out. They have great stuff in there but you have to buy things when they are there as their stock changes constantly. Don't plan to go back next week for something as chances are it won't be there.
We saw the coolbox - I reckoned I could have taken it instead of a tent - I'm only little and I reckon I could have slept in it (was gonna try in the store but I'm fed up with being looked at like a loon
)
They often have camping stuff in there, they had the coleman dual fuel dual burner the other day at a good price.
Their food is good as well, great quality meat and fish at good prices. Some of their tekky stuff, flashcards, memory sticks etc. is good value as well as writeable DVD's, batteries etc. etc.