As you probably know 'Responsive Design' refers to an easy way to dynamically customize interfaces for different devices and to serve them all, with no need for a separate mobile domain.
Internet enthusiast or a local business vendor must not be discouraged by the various costs of running a website. Some firms trap customers in with the assurance of one-time payments. As good as this sounds, beware. Web sites have maintenance fees (typically funded once-a-month or annually) that can't be escaped. Whichever company that claims otherwise is being fraudulent.