Amazon is have a deal on Dynamo liquid and Prime Members get an extra 10% off.

The best deal is 4lt for $13.20 for prime members (or ~$12.30 with 7% ShopBack)

It comes with a easy to use tap, so when you’re finished you can fill it with your favourite juice of goon bag. That’s right no more embarrassment from taking your favour chateaux cardboardannay to the next party, just fill this baby, plonk it in the laundry and help yourself. No more harassment from the cops when having a quiet drink in the park. No more feeling you need to finish the whole 4lt in order to have a pillow. Accidentally spilt some goon on yourself? No worries, the residual detergent will clean it up. You’ll look a million dollars, you’ll smell a million dollars

Thanks guys below, original & professional is out of stock

Professional Version.(Only 3.6l) is in stock and the same price

https://www.amazon.com.au/Dynamo-Professional-Liquid-Laundry...

Alas you’ll have to skol 400ml to fit your cask inside. But shouldn’t be an issue for us professionals