Alongside game sales on PSN of just about every Sony title and some from others there are decent deals for PS+ and PSNow. PS+ is £35 and a year of PSNow is £60. Both stack and both come out of your PSN wallet so can be combined with cheap credit. CD Keys has £35 credit for £30 for example.
Was thinking of binning my PSNow sub when it runs out in November but recent talk of strengthening the library and improving the service has me wavering. Less than £5 a month? Tempting.