No I am not using the range extender ant, but you can get them for the kit I use. My house is not that big though.
You can buy car adapters that will give you 5v, places like Radio Shack etc have them for cig lighter sockets in cars, for portable CD players, hand held games. I took off the plug and hard wired it to an always available 12v supply, with fuse and switch in line. I only have it live ( switch on ) when engine not running, just to be on safe side.