My go-to deal for booze on the regular. 20% off Liquorland specials (via Coles Online), add a Fly-buy offer (e.g. 2000pts on $50 spend, 1200pts on $30 spend), and you end up with good prices without a 3-5mo wait and risk of denied cashback.
Examples for me are:
JW Double Black: RRP $77, Special $58, 20% off $46.4, combine with FB offer net ~$36-40
Carlberg's slab: RRP $50, Special $42, 20% off $33.6, combine with FB offer net ~$23-27
Often can combine with promo vouchers for $200 or $250 spends (couldn't find any on a quick search).
Looks like some small cashbacks might be available (haven't tried).
Usual disclaimers that some struggle to work the Coles Online site (I haven't had trouble for 2-3 years when I started using it), and not available in all states
Any discount codes?
edit: CLICK10 and NEXTSHOP10 were accepted but I couldn't get them to actually give me the additional discount.