Is It Too Late to Buy Costco Stock Now?

Costco's share prices are up more than 600% over the past decade. Is it too expensive to buy?Costco Wholesale (COST -0.22%) has an impressive record behind it, with the business growing strongly for years and the stock price rising along with it. At this point, share prices have soared over 600% in just 10 years compared to a far less impressive 170% gain for the S&P 500 index.All that growth has some investors wondering if perhaps they have missed their opportunity to take a ride. Is this rocket ship headi ...