Costco Wholesale Corporation (NASDAQ:COST) shares traded higher Wednesday before the company reported its September sales figures after the closing bell. The Details: Costco reported net sales of $24.62 billion for the retail month of September, which represents an 8.9% increase over sales of $22.59 billion from the same period last year. Comparable sales, excluding the impacts from changes in gasoline prices and foreign exchange, were up 9.3% in the U.S., 6.3% in Canada and 22.9% in e-commerce. Read Next: What’s Going On With SoFi Stock? The company said this year’s total and comparable sales…