get a line get 2nd free for 1yr

I went to my xfinity store in Greeneville,TN last wk, they had a huge sign on the side walk saying for new lines of courses but get 2 and the 2nd free (the monthy rate)for a year. I thought no way but when I got home I called to see if it was true. It was but I do not see it on their website. I know its not or couldnt be after only a wk after seeing it but hey anybody needs a good deal this is one of the best I have saw lately. basically buy1get1 but just for a year