I found this via the Samsung My Galaxy app so you may or may not need a unique code to get this offer. NB no NOWTV box is included in this offer so you will either already own one or you will have to purchase one separately. Take care if you are already taking advantage of a different offer.
'Join today for just £3.33 a month for 3 months thanks to Samsung.
Offer available for new and existing NOW TV customers who obtain a unique NOW TV code from Samsung My Galaxy. 18+. UK only. At the end of the three-month period, access to the NOW TV Movies Month Pass service will automatically renew at £9.99 per month, unless cancelled. Offer price lost if you cancel your Pass before the last month of the offer period. Offer not available in conjunction with other NOW TV offers, unless redeemed in the last 30 days of the current offer.'
NB offer ends 18/12/2015