I tried to research this deal in Chicago. It seems that they are not offering this 19.99 deal. Here's the reply I got from the Concast Customer Care:
Thank you for writing to Comcast.
Thank you, for your interest in the Comcast High Speed Internet, the service is currently available to you. The current promotion is $19.99
for the first 3 months with the installation charge being $24.95. The Tech, would need to install a separate line for the computer and will be installing a external modem, the modem charge will be an additional $3.00 monthly, if you are providing your own modem the retail cost once the promotion has expired will be $42.95 w/your own modem, or $45.95 w/Comcast modem. If, your ready to order contact our Chicago Customer Care toll free number 1-866-594-1234, any further questions can be handled by this department.
Thank you again for contacting Comcast.
cv-Lorraine W
Comcast Online Customer Support Center
IN REPLY TO MY EMAIL:
Category: Product Information
Sub-Category: High-Speed Internet
i'm interested in trying out your High Speed Internet. I heard that you currently have an offer going on for new customers: 19.99 for first 6 months. If that is true can you please contact me and let me know about your intallation procedures?
Thanks