Me too, for about 3,000 yen one way, sometimes with a several day subway ticket included (look for signs when buying ticket at the airport). From HND, IIRC the limobus is more like 1,000 yen (although I remember different prices for night and day), which again is a lot less than a taxi or the hotel's car service. However, to/from HND, it's pretty reasonable to take a regular taxi if the limobus schedules aren't timed well for your flights or just to save a bit of time.