Back in March the red iPhone 7 and iPhone 7 Plus were announced. The color option was part of the (Product) RED charity line of products and a fresh addition to the usual gamma. Yet now after the announcement of the iPhone 8, the iPhone 8 Plus and the completely new iPhone X, the red version is no longer available for purchase. iPhone 7 Plus (Product) Red special edition This leaves your options limited to jet black, black, silver, gold and rose gold. The red iPhone 7 is still listed on retailers like BestBuy and Amazon. Online shops are most likely selling whatever units...
Source: http://www.gsmarena.com/apple_silently_ditches_red_iphone_7-news-27241.php