Some things it's just more economical to buy in bulk. Costco makes a 20 pack of paper towels affordable and during the holidays bakes your pumpkin and apple pies for dirt cheap and amazing taste. Their Kirkland brand keeps up to brand name products in everything we have tried. They also do immediate rebates at times and if you buy a lot of things (ahem-family of five and three pets) their premium membership is more expensive but you get paid back a percentage of what you spend.
While not a huge clothing selection we have also bought items from there and have found them worth the price. My five year old's snow suit is still strong after a few months of messy/wet play.
The staff is pleasant and helpful, on weekends you can battle the rest of the customers, but snack freely on delicious samples. The welcomes and cart checkers are incredibly friendly and make extra effort to make you smile. Well worth the yearly cost of a membership.