Apple Inc. sold about 200,000 iPhones in the first 24 hours the product was on store shelves. By late Sunday, 520,000 gadgets had sold. The iPhone, which also works as an iPod music player and a wireless Web device, went on sale the evening of June 29. It sells for $500 for the 4-gigabyte version and $600 for the 8-gigabyte model. The phones were going for nearly $750 on eBay. Despite their popularity, the Apple Store at the Fashion Mall at Keystone still has "quite a few" in stock, according to an employee there this morning.