9to5Mac has obtained an internal Sprint inventory document that reportedly reveals September 25th as the day that the Apple Watch will be making its way to carrier stores. The documents show that Sprint will be offering both sizes of the Apple Watch and will have the Sport and the standard Watch in stainless steel and possibly also the new Space Black stainless steel. Unsurprisingly, the Apple Watch Edition is not expected to be in Sprint stores. Pricing all seems to match up with Apple's standards, which means $349.99 for the 38mm Sport, $399.99 for the 42mm Sport, $549.99 for the 38mm steel Watch, and $599.99 for the 42mm steel Watch.
Interestingly, while there are alternate watch bands on the Sprint inventory, they are all third-party bands. It doesn't appear that Sprint will be selling any official Apple-made bands. The watch bands listed are made by CaseMate and Mophie instead.
As of right now, that is the best evidence around that the Apple Watch will be found in carrier stores on September 25th. 9to5Mac has reported rumors about AT&T also carrying the Apple Watch the same day, and T-Mobile's John Legere has tweeted about carrying the Watch, though no date was ever mentioned there. The only carrier without rumors of carrying the Apple Watch is Verizon, so we'll have to see how that goes.