The deal page also says 50% off, I don't believe that to be the case. It looks like they're advertising 50% of the RRP as a special but in reality they are everyday prices. The real bargain is free shipping. Normally you would pay:
$8 = 1 case
$16 = 2 cases
$20 = 3, 4, 5 cases
Not working: this voucher does not apply to items in the cart
*T's & C's apply. Free delivery on your entire order when your basket contains at least one product contained in our dimmi promotion
http://www.ozbargain.com.au/node/122985 This deal is better value, unless for some reason you can't or refuse to pay by PayPal (or you've already used that code)
They'd want to be real careful if they're promoting regular prices as a sale - Zamels (I think) was just done over for exactly this.
You're not even trying anymore winemarket (shakes fist).
Bring back the $30 off coupons.