You can get a Now TV 3 month pass for £13.99 here:
http://www.amazon.co.uk/dp/B00T6QAZ1...=IDI0EBW42RBEY
And if you don't mind the original Now TV box, you can get box plus 3 months for £14.99 here:
http://www.amazon.co.uk/gp/product/B...ilpage_o04_s00
Giving you a box and 6 months entertainment for £29.
The new Now TV box has a faster processor and also has the option of wired internet as well as wifi.
The new box is also capable of 1080p (old one 720p), however all Sky content via Now TV is 720p.
I have both the old Now TV box and the new one and they both work fine.
BTW I'm not sure re delivery costs on the Amazon links; I have Prime, so for me it's free.