Was browsing BWS website and noted Glenfiddich 12 on special for $60 for Woolworths reward members, added Monkey Shoulder Whisky for free delivery and came up for $10! Also get a free beer with Glenfiddich. Not sure if this works with any other combos.
Combine with wish gift cards and cashrewards for even more discounting goodness.
Edit: may be pricing error? From the comments available with any $28 purchase in SA/VIC/WA.