When you walk around Costco, there's one thing you can't help but notice. And it's not just the fact that many of the items are supersized. Costco's prices, even for non-bulk items, are among the most competitive in retail. And that's incredibly important at a time when so many consumers are struggling. In November, prices for common consumer goods and services were up 2.7% broadly, according to last month's Consumer Price Index. Food costs rose 2.6%, electricity was up 6.9%, and piped gas service was u ...