AT&T Selling Refurbished 16GB iPhone 5 for $100
That $100 price tag is for the 16GB model and is available in black or white. You can also grab the 32GB model for $200 or the 64GB SKU for $300, both available in black in white as well, and both refurbished. New iPhone 5 models sell for $199 (16GB), $299 (32GB) and $399 (64GB), so you're saving $100 on whichever model you go with.
We have no idea if this is a Black Friday deal or not, as AT&T's website doesn't say one way or the other. However, Apple is real good about replacing the battery and chassis on refurbished models, so you shouldn't have to worry about getting a scuffed up iPhone. How long it stays that way is another question entirely.