You Can Track iPhone 6s Stock
Apple Stores and other retailers won't tell you how much stock they have ahead of the iPhone 6s release date so you'll want to choose your store wisely.
Flagship Apple Stores and retail locations typically have the most stock but they also tend to have the most foot traffic. In the past, we've had success with smaller less visible locations like carrier kiosks inside of local malls. Don't be afraid to pick up the phone.
If you don't want to deal with driving or calling around, you should be able to track iPhone 6s inventory come Friday. There are several online tools that you'll be able to use and you'll want to keep that in mind as we approach the iPhone 6s release date.