Have been ordering seafood from these guys. Pretty easy to order over $80 to get free delivery.
The Tuna Saku blocks are 300-400grams each so you get up to 2kgs of Sashmi Grade Tuna for $53.19 (So approximately down to $26.60 a kilo).
Melbourne-3000 code gets you a 10% off the full order.
The blocks are individually vacuumed sealed, and can be stored, so you don't need to eat it all at once.
I took a video of myself weighing the blocks