AT&T is once again offering refurbished iPhone 3G units for $99. As the company did for a brief time in late December, 8GB models are available for $99, while 16GB refurbs are selling for $199. The prices on refurbished iPhone 3G units have generally been $149 for the 8GB and $249 for 16GB units. As with new iPhone 3Gs, the refurbished units require a two-year contract, and AT&T notes that all refurbished iPhones carry a warranty of 90 days…
