Right now from costco you can get 24 x 500ml bottles of Vittel mineral water for only £3.44, now that is a bargain.
No harm in stocking up. Its the normal top one not the sports cap, its even cheaper than the supermarkets 6 for £1 deals that they have sometimes.
I know everyone cant shop at Costco, etc etc but it doesn't stop them having cracking deals.
I know i'd be frushtrated if i couldn't become a member, but those of us that are member do take it for granted!