Save Money on Slabs of Beer (Damaged Cartons) - Woolworths
I'm not sure if this has been shared before, but I have successfully received a discount a number of times by taking a damaged box of beer to the counter and asking for a discount. Discounts have ranged from $5-$10 a carton. Another tack is to take an undamaged box to the counter and mentioning there is a damaged one.
Apparently they hate having any damaged boxes in stock as most people won't take them.