Ok, let's try out those stacking skills:
1) BoozeBud have 15% select bottles of whisky with free shipping when you buy 2: https://www.boozebud.com/promotions-rules?tags=918&filtercon…
Trick here is that you can add one bottle (such as the Bruichladdich for $99.15) and a can of the Cougar Bourbon & Cola ($3.80) to activate the deal.
Try to have the final cart total around the $87 mark to take advantage of step 2.
2) 35% cashback through ShopBack with a max of $30 here: https://www.ozbargain.com.au/node/622670
3) 15% credit from AMEX if you registered here: https://www.ozbargain.com.au/node/616743
4) Shop small bonus points from AMEX here: https://www.ozbargain.com.au/node/614001
If you're still with me you can end up with a $100 bottle of whisky delivered for around $57 (after cashback) or $44 (after AMEX credit).
The Port Charlotte Heavily Peated is $114.99, not $99.15. Google says it's $99.15, so I'm guessing they upped it? Dan's has it for $99.10 online only, so they were likely beating Boozebud's price.
Your final price is about right though:
$114.99 + $3.80 = $118.79
Less 15% Whiskey Day promo = $100.97
Less 10% Bestbud = $90.87
Less 15% Amex cashback = $77.24
Less $30 Shopback cashback = $47.24