Future are doing another of their '3 for £3' offers, with Official PlayStation Magazine.
The three issues you'll get (Sept/Oct/Nov) are three big ones, with cover features on their 20th Anniversary, Star Wars, and awards for 2015.
You have to subscribe with Direct Debit to get the offer, but can cancel at any point to avoid a further charge.
Offer expires on 09/09.
EDIT: The months above were written as the months the magazines will release. Should have made clear though that technically, the issue released in Sept is actually the Nov issue, and so on.
So, I presume the three issues will be: Nov, Dec, Xmas.