Great Magazines are currently running an offer, where you can get 8 issues of Zoo Magazine delivered for only £1 (trial offer), then it reverts to a 6 month direct debit of £30.
You can cancel the direct debit anytime after you have recieved your first issue, meaning that you only pay £1 for all 8 issues. After the trial period is up, you will not be charged further (obviously you won't get anymore than 8 magazines).
Also, go through Quidco and you get £2.50 cashback, giving a potential profit of £1.50.
Offer is valid until end of May.