This works out to be $5 per issue. Cover price is $7.95.
The normal price for an annual subscription is $49 from the official Donna Hay website, but ranges from $42-$50 for other online magazine retailers. I haven't seen $30 before.
http://www.donnahay.com.au/magazine/subscribe_and_win.html ($49)
Terms and conditions states that it's until 17th June 2012 only, but offer still seems to be live.
Edit:
According to isubscribe, if you already have a subscription to this magazine with issues remaining(even if it is through a different subscriber), you can still renew with them on this offer, but make sure you use the same name and address as your existing subscription. They said that they will work out when your new subscription should start so that you don't get an overlap.
Don't bother, she can't cook.