We've already got posts for most every cheap spirit First Choice are selling via the Ebay 20% off deal:
The original 20% off deal with Johnnie Walker, Canadian Club Whiskey and Dimple:
However, as yet we don't have the cheapest of them all:
Cleanskin Vodka 700mL ea - Spirits - Origin Australia $22.40 (with 20% discount code)
https://www.ebay.com.au/itm/332460254253 Pickup is free or $6.95 delivery
Most important facts here are:
Alcohol Content 37.0 %
Country of Origin Australia
Volume 700 mL
OzBargain style disclaimer:
The current cheapest (drinkable alcohol content/$) appears to be at Dan Murphys:
Hollandia, 330ml x 24 @ 4.7% for $29.99: https://www.danmurphys.com.au/product/DM_367804/hollandia-be...
TUN Red, 330ml x 30 @ 4.0% for $29.99: https://www.danmurphys.com.au/product/DM_460724/tun-red-drau...
Ebay and Dan's both have CashRewards rebates so don't forget those (not included in discounted prices above).