This works out £7.25 a month, which is a £1.75 saving on the normal monthly fee, the savings start building up as you keep playing. For those who havent tried the game yet you can get a 10 day free trial on the website, be warned this game can be quite addictive - choose life!
Actual price on the cd-wow website is £15.99, use the link opposite to drop it to £14.99 and then the attached voucher to drop a further 50p (can sometimes be more).
NOTE: I would recomend using the 'other cards' option when you get to payment options as this goes through world pay and shows up in browser as secured. The other method didnt and scared me a little (even though i think its fine)