The 16GB Sprint Apple iPhone 4S will be found at Radio Shack stores that currently offer Apple's touchscreen device while those that don't offer the device can have it ordered. The Sprint 8GB Apple iPhone 4 has been available through Radio Shack since the store started selling the Verizon and AT&T models of the Apple iPhone 4S last month and alerted Sprint customers at the time that the 16GB version of the iPhone 4S for Sprint was coming. Those seeking the 32GB or 64GB models of the phone will need to look elsewhere.
source: 9to5Mac via PocketNow
A leaked internal Radio Shack memo confirms that the Sprint version of the 16GB Apple iPhone 4S is now available at certain stores