Honda sells a device which allows the owner to refuel at home, by compressing the natural gas from home gas lines. It will compress enough gas for a complete refuel overnight.
That would be Phill.
Unfortunately, they aren't available everywhere: "Phill is currently available for purchase in the US in select parts of California, Arizona, Colorado, Illiniois, Indiana, Michigan, Nevada, New Jersey, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Utah, Washington, and Wisconsin."
A friend of mine checked into it in California, and the local dealership would sell your a Phill and a Honda GX together as a package, and finance them.
It takes about 4 hours to compress and fill the tank with enough CNG for a 50 mile trip. The cost depends on how much you pay for natural gas, but I believe that generally, the cost is about $1.50 per equivalent of a gallon of gasoline.