The iPhone 5 looks like it will be here sooner than expected as it is rumored that Radio Shack's inventory has Apple's next-generation smartphone listed for Sprint, AT&T and Verizon.

9 to 5 Mac released a photo of the inventory it received on Saturday. The photo is a screenshot allegedly showing Radio Shack's inventory page, which listed a 16GB and 32GB iPhone 5.

Rumor has been circulating that Apple will release two new iPhone models this month. If the photo is indeed of Radio Shack's inventory, it is the first evidence of an iPhone 5, as all other rumors and photos were pointing to an iPhone 4S.

Reports have been that the iPhone 4S showed up in Apple's internal inventory, and there was also a white version in AT&T's.  Back in September, 9 to 5 Mac reported the two new iPhone SKUs showed up in the system and were marked as tweaked iPhone 4S.

Additionally, a packaging barcode was leaked late September and was labeled iPhone 4S.  A report this week also stirred rumors that the new iPhone may also come in a 64GB version, and would be HSPA+ compatible.

The Wall Street Journal, back in August, reported that Sprint will begin selling the new iPhone in mid-October. That reported noted that the Apple's new smartphone would be called iPhone 5. Bloomberg also reported in early September that Sprint will offer the iPhone in October with unlimited data service plans to set itself apart from AT&T and Verizon.

Apple remains tight-lipped about its next generation of smartphones, but has confirmed an Oct. 4 iPhone meeting with the press at its Cupertino, Calif. campus.

Apple sent invitations to the media last week, which features a cluster of four iOS icons and the tag line Let's talk iPhone.

Stay tuned.