Supplies are tight, prices are climbing, and US shoppers are flocking to Costco to get a good deal. No, we're not talking about gas — this time. The wholesale club has been broadening its selection of protein-packed foods and drinks, and the products are proving to be a huge hit. "Anything protein right now is doing extremely well," Costco's chief financial officer, Gary Millerchip, said during the company's quarterly earnings call on Thursday. "We're really leaning into those items, because of what we're seeing with our members and the value and quality they're looking for." The boom in protein demand is also being felt all across the economy as ingredient prices spiral higher. The US Department of Agriculture said last week that prices for whey protein concentrate are getting higher thanks to high demand and low supply. Read more about Costco's strategy as protein demand booms at the link in our bio. Story by Dominick Reuter (Credit: Dominick Reuter/Business Insider) #Costco...