BIC Kids Triangular Colouring Crayons, Pack of 12 $3.90 ($3.51 S&S) + Delivery ($0 with Prime/ $39 Spend) @ Amazon AU

Description: BIC Kids Plastidecor Triangle colouring crayons are recommended for kids aged 30 months and up. The triangular shape helps children position their fingers on the colouring crayons naturally. The no-mess plastic wax barrel means no marks on hands or clothing, making them the perfect for kids. This wallet contains 12 assorted vibrant colours, so kids are free to create lovely masterpieces. Made with kids in mind, these kids colouring crayons are durable and wont break with if dropped on the floor

Found these while looking at the other Art Supplies deal: https://www.ozbargain.com.au/node/665195
Cheapest larger-sized crayons I could find, 3C's suggest its the lowest ever price for this product.

If you don't have Prime:
Officeworks have round-shaped-ones 28 for $4 https://www.officeworks.com.au/shop/officeworks/p/keji-jumbo…
KMart have 8 Crayola Triangular for $4 https://www.kmart.com.au/product/crayola-my-first-washable-t… (in-store only and limited stock)