I noticed yesterday that Comcast removed their normal Performance internet promotion for $29.99 so I called some of the authorized retailers. I thought I'd share what I found.
Their website shows $29.99 for Performance and $39.99 for Blast in my area, but when I called, I was offered $19.99 for Performance and $29.99 for Blast for 12 months.
This is for new customers only. Good Luck!
Edit: Forgot to mention you have to pay $19.99 for installation and $14.99 for their "fee". Still worth it in my opinion.