Lately, buying meat has been like playing the stock market for Lake Burrito restaurant in North Forsyth.Paris Retana, culinary director of the small, family-owned eatery off Keith Bridge Road, is used to getting meat priced by the week. But all that changed after the novel coronavirus infected hundreds of workers at production plants across the U.S. and threatened the country’s supply chain.Now, meat prices change by the day, Retana said, and sometimes even the hour. Meats like pork or steak are seeing mark-ups anywhere from 60% to 90%.“It’s just insane,” Retana said.It’s been one more strain on a restaurant that had built something of a cult following in the local community.