There's a cracking deal on PlayStation Plus currently doing the rounds, but it's for quite a specific group of people. You can get a year's subscription to PS Plus for half price -- if you live in the UK or Germany, and don't already have an active membership.
Posted on gaming forum ResetEra, the PlayStation Store offer seems to only be active in those two countries, and is only open to those who don't already have PS Plus. If you're within the restrictions, you can get 12 months of membership for £24.99 / €29.99, down from £49.99 / €59.99. It's a great offer that will hopefully expand to more territories.
If you already have an active subscription, you won't be able to take advantage of this deal -- even if you cancel your membership and then attempt to purchase the reduced rate. This seems to be an offer squarely for getting new people jumping on the bandwagon, which makes sense. Again, it'd be good if this comes to more countries, and we'll update you if anything changes.