Costco says its warehouses carry about 4,000 stock-keeping units (SKUs) compared to the 30,000 found at most supermarkets, and it carefully selects the products it carries based on quality, price, brand, and features.While the prices for goods and services provided by Costco have risen over the years, there’s one thing that hasn’t changed, and it’s subsidized by the revenue generated from its sales and membership fees. Costco’s price for a large hot dog and a 20-ounce soda combo has remained the same—at $1. ...