Costco Wholesale (NASDAQ: COST) has been a dominant player in the retail space for decades. For its shareholders, the results have been even more impressive. Over the past five years, Costco's stock performance has outpaced the S&P 500 by nearly 150 percentage points.

As an employee, I think the tiramisu cheesecake, Essentia water, and Igloo cooler bags are some of the best things to get at Costco right now.

This March, there are plenty of deals to lure you down the aisles. There’s nothing quite like a good Costco run—the thrill of buying a lifetime supply of paper towels, the free samples that somehow turn into a full meal and,

Basically, when you examine Costco's valuation you can only come away with one take -- the stock is historically expensive. Yes, it is a good company, but it probably isn't a good stock to buy right now.