NEW YORK—The Perfect Pigg, a gift shop owned by Ginger Pigg, is the go-to place for residents of Cumming, Georgia, to pick up gift items like kids toys and home goods. But this year, store shelves might be a little sparse. Because of bottlenecks in the global supply chain, many stores like Pigg’s are scrambling to try to get all the inventory they can ahead of the crucial holiday shopping season. “I’m a little stressed,” said Pigg, who has about 60 percent of the Christmas inventory she usually has at this time. Some stock she ordered in July hasn’t arrived yet. “I feel like I’ve done everything I could do,” she said. “I’m hoping and praying it all comes in.” The global supply chain has been buffeted by a multitude of problems, from factories having to close due to COVID-19 surges, a lack of containers to ship items in, backups …