I'm actually being proactive with this thread and posting before they come to install. I just got off the phone with Comcast Customer Service. Ordered two cable cards. The CSR was very nice, and added that to my order with no problem. No quote on the charge, and I didn't ask. Due to "rolling blackouts" while internet service is upgraded, I have to wait until July 30th for the internet and cable service installation. I was quoted $143.55 at the time of installation for this to be done. I will report back here on my experience.