Costco (NASDAQ: COST) recently reported strong fiscal third-quarter results and talked about a potential membership-fee increase down the road. The stock has been a strong performer, up over 60% in the past year.

Let's take a closer look at the retailer's most recent earnings, the potential impact of a membership-fee increase, and whether now is a good time to buy the stock.

Costco's stellar fiscal Q3 results showed its revenue rising 9% to $58.5 billion. Retail sales accounted for $57.4 billion of the total, with membership fees totaling $1.1 billion.

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Source Fool.com