Don't Expect Ample iPhone Stock
If you want a new iPhone in September, be prepared to pre-order.
As we approach the iPhone 8 release we continue to see rumors hint at potential shortages at launch. These are supply chain rumors but you should take them seriously. New iPhones almost always sell out ahead of their release.
You should expect Apple's new iPhones to sell out ahead of their release date. You should also expect the cheapest variants (least amount of storage) and any new colors to sell out the fastest.
If Apple announces new colors with the iPhone 8, you can expect those models to fly off shelves once pre-orders begin.
Last year, Apple stores were completely sold out of all Jet Black iPhone 7 models and all iPhone 7 Plus models (all colors) on release day.
If you're planning to buy an iPhone with a big screen (iPhone 8/iPhone 7s Plus, be prepared to put in a pre-order. Otherwise, you might be in for a long wait.