You can take the train to Narita city (first stop) not far from airport. Just at the bottom of the hill it has hotels with crew rates around 50 USD. You can also get good rates at agoda.com. You can also take the Skyliner train to Ueno (second stop) if you want to get closer to down town Tokyo. There is a businessman hotel for 50 USD but VERY small rooms out the door from the Skyliner.