It does have a day membership at £11.99.
Current sports offer on the website for the full month membership is £25 a month for 6 months. Although the cancel game is your friend and it’s got me paying £20 a month for 6 months.
Only rarely will you see offers for £9.99, although I’ve seen a few fellow customers say they’ve got this excellent offer.
There is the now mobile pass for 9 months which you get with a day pass for £11.98. If you have a decent mobile phone like a Moto g82 with a 6.6" screen and stereo sound it is pretty awesome.
Also if you sign up for the marketing emails from Now TV there is an offer of £14.99/month for 4 months. Sometimes there are even offers for £9.99/month. Will send you a PM with £14.99 offer.