The NEX return tickets are only available from 14 Mar. validity is 14days.
http://www.jreast.co.jp/e/pdf/ntrt_150116_e.pdf
Current package is only from NRT to Tokyo at 1500 one way. If you prefer NEX to return to NRT, then u have to buy their regular priced ticket at 2990. Its one of the most expensive way to NRT.
Hi cpuer, Thanks for your reply. As i will be arriving at Haneda Airport. Can i check am i able to purchase the narita express tickets at shinjuku JR service centre?