Pay a pound, get 3 issues, cancel within the trial period an pay no more - or keep subscribing at a discounted rate by Direct Debit. The phone number to cancel is always on the sites.

Most have free downloads when you signup too!

Computer Shopper Magazine - Britain's Biggest Technology Magazine - Computer Shopper
Auto Express - Auto Express 6 issues for £1 (6 FREE issues!)
Poker Player - Poker Player 3 issues for £1
Money Observer - Money Observer - 3 for 1
Moneywise - Moneywise magazine trial offer
Evo Magazine - evo magazine - the official subscription website
Fortean Times - Fortean Times- 3 issues for 1
Octane - Octane Magazine
MacUser - MacUser Magazine - 3 issues for 1.00
Men's Fitness - Men's Fitness - 3 issues for £1

Enjoy!