Costco Warehouses carry just about anything and everything you may need, always at great prices!
Costco focuses on selling products at low prices, often at very high volume. These goods are usually bulk-packaged and marketed primarily to large families and businesses. Furthermore, Costco does not carry multiple brands or varieties where the item is essentially the same except when it has a house brand to sell, typically under the Kirkland Signature label. This results in a high volume of sales from a single vendor, allowing further reductions in price, and reducing marketing costs. If Costco management feels the wholesale price of a product is too high, they will refuse to stock the product.
Lighting costs are reduced on sunny days, as most Costco locations have several skylights. During the day, electronic light meters measure how much light is coming in the skylights and turn off an appropriate percentage of the interior lights. During a typical sunny day, it is very common for the center section of the warehouse to have no interior lights powered on.
Most products are delivered to the warehouse on shipping pallets and these pallets are used to display products for sale on the warehouse floor. This contrasts with retail stores that break down pallets and stock individual products on shelves. Costco limits its price markup on items to 15%.Source: Wikipedia - Costco