Kent Street is my go-to for large format if you don't already check their store.
https://kentstreetcellars.com.au/collections/large-format
Looks like a 3L Mumm that's okay priced. They have 10% now and then too. I'm sure there's cheaper elsewhere.
Just noticed the cancelled order has contributed to the unlocked level. Might rectify after a few days but could be a little trick to bump levels if they don't track a cancelled order.