Nov. 8 (Bloomberg) -- Costco Wholesale Corp., the seller of discounted Cartier watches and cartons of diapers, said October sales at stores open at least a year rose 9 percent.

Overall net sales increased 13 percent to $5.2 billion in the four weeks through Nov. 4, the Issaquah, Washington-based company said today in a Market Wire statement. Sales at U.S. outlets open at least a year gained 7 percent, and international same-store sales rose 17 percent.

Costco, where members pay an annual fee to shop at warehouses for discounted food, electronics and clothing, has prospered by carrying luxury items alongside basics. Last month it reported fourth-quarter profit of $372.4 million, beating analysts' estimates.

Most U.S. retailers report October sales today, including Wal-Mart Stores Inc., the world's largest retailer and the owner of Sam's Club.

Sam's Club reported a 4.2 percent October same-store sales gain, including fuel.

Costco rose 43 cents to $66.58 at 4:30 p.m. in Nasdaq Stock Market composite trading. The stock gained 26 percent this year.

To contact the reporters on this story: Lauren Coleman-Lochner in New York at llochner@bloomberg.net

Last Updated: November 8, 2007 16:44 EST