Hi,
We've been members of Costco for many years now and we are quite happy with their quality and price.
It is really worth becoming a member if we are buying a lot of items and not just for fruits. And they do accept coupons.
We find it very economical to buy Dish gel, dish liquid, Kitchen paper towels, Toilet tissues, many fruits,Milk, English cucumbers(these come in packs of 3 which are really less when compared to buying individual pieces in other stores), Extra Virgin Olive oil, nuts, Pasta, coffee powder, Juices-both bottles and cartons, some snacks, cereals, Trash bags, soaps etc.
This definitely works out cheaper compared to even Walmart and other stores.
Moreover, we don't need to drive miles to this store.
Of course we can fill up the gas too, although many gas stations now offer competitive prices too !
One more thing, even if we are not satisfied with the perishables/non perishables they gladly refund the money.
But as Nandhu pointed out, they accept only AMEX credit cards or Debit cards.
Cheers
Krithika