Costco Wholesale (NASDAQ: COST) is doing well in a tough selling environment. That was the headline takeaway from the retailer's March earnings update, which showed solid sales growth through mid-February.

The giant warehouse retailer continues to win market share thanks to its low product prices. Yet its members aren't simply buying consumer essentials anymore; they're also increasingly splurging on discretionary products like jewelry, gold, and appliances.

Let's take a look at the most encouraging news from this latest earnings report, and whether it means the stock is still an attractive buy right now.

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Source Fool.com