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.

Costco's stock price has surged 50% since April last year, pushing its PE ratio from 45x to 62x, despite modest sales and earnings growth. Click here to read.

Some people find it impossible to sleep in total silence at night, or alternatively, they need something that's loud enough to drown out city sounds to lull them to sleep. Whichever camp you're in, a popular mini fan from Costco is a white noise lover's dream.