Cox Communications, the third largest cable provider in the United States, is the only company I've found that has made its surveillance price list public. Thus, we are able to learn that the company charges $2,500 for the first 60 days of a pen register/trap and trace, followed by $2,000 for each additional 60 days, while it charges $3,500 for the first 30 days of a wiretap, followed by $2,500 for each additional 30 days. Historical data is much cheaper -- 30 days of a customer's call detail records can be obtained for a mere $40.
Comcast does not make their price list public, but the company's law enforcement manual was leaked to the Internet a couple years ago. Based on that 2007 document, it appears that Comcast charges at least $1000 for the first month of a wiretap, followed by $750 for each month after that.
Seems that those skyrocketing telecom bills aren't the major source of income for those CEOs; selling you out to the government is where their bonuses are coming from!