Saw this offer advertised in todays Guardian.
Call 0845 357 3007 and quote GUARDIAN for a free copy of Men's Fitness.
You do speak to an operator who takes your address and then offers you a further 3 copies for £1. I did this but you dont have to, but if you do, in effect you get 4 copies for a quid.
This isnt an on line offer - you do have to call.