If you’re still trying to get your hands on the Sprint iPhone 4S, you’ve now got another outlet. According to internal documents we’ve obtained, RadioShack will be adding Apple’s latest handset to their Sprint lineup this weekend. Some stores should have stock now and many more will be getting it over the coming days. Unfortunately, if you want the 32 or 64 GB models, you may be out of luck, at least for now. According the documents we’ve seen, there is no indication that those models will be available at this time at Radio Shack.

The 16 GB model will be available in both black and white, and will be available at all stores that currently carry the iPhone, and stores that don’t typically carry the iPhone should be able to order it in. RadioShack has carried the iPhone 4 on Sprint since they started selling the 4S on Verizon and AT&T last month with a note that the Sprint 4S would be available at a later date, due to inventory issues.