Mmmm - Costco! Definitely the best place to go (at least in the UK) for party food and drinks. Just saved about £70 stocking up for next weekend - that's about a 25% saving over high street stores!

Their prices on electrical/coputer gear don't seem as competitive, though - in some cases they are more expensive than the high street, and in all cases I could get cheaper/better kit from dabs.com