Brennen, thanks for posting to the forums. Some companies like CenturyLink have a price for life, where you pay a flat fee that remains the same and are a month to month service. As far as the modem goes, you can check with spectrum to see what you are paying for it monthly and opt to buy your own instead of leasing it through them. If you decide to go with the Eero system, you still need a modem. Let us know if there is anything else we can do to help.