Asking $80. Works perfectly. Charter just changed their policies and I can no longer provide my own modem. I've got all the hardware, box, and manuals. More info here: http://www.amazon.com/gp/product/B001UI2FPE/ref=oh_details_o00_s00_i00 (http://www.amazon.com/gp/product/B001UI2FPE/ref=oh_details_o00_s00_i00)
Just note that the SB6120 is not on the TWC approved model list. http://www.timewarnercable.com/en/residential-home/support/topics/internet/buy-your-modem.html
It doesn't have to be if you get tier 3 to activate it.
The Ubee DDW3611's aren't on the approved list either - yet techs in our Milwaukee market just got them in to start giving out to customers recently. (other markets have given Ubee's to customers for years now)