A new Costco location is gearing up to open in Ontario this fall, and no, it's not another regular warehouse. Costco Canada is preparing to open its fourth Costco Business Centre in Ontario, at 3115 Argentia Rd., which is just off Highway 401 and Winston Churchill Boulevard in Mississauga,. The new store, which is set to open sometime this October, differs from your traditional warehouse. As its name suggests, Costco Business Centres are specifically geared toward businesses and carry thousands of products that are not available at the retailer's regular warehouse locations. This follows the brand's most recent Ontario addition, a standard warehouse that just launched in Newmarket last month.