Was trying to find these at Bunnings for $17.88 (https://www.ozbargain.com.au/node/665597) but they were sold out at my local. Thought I'd check what they were priced at Amazon and only $19.00. Camelcamelcamel says it's been this price since mid November.
Looks like its $17.88 at a bunch of other places like JB Hi-fi and Officeworks. If you're a prime member than you may not mind paying the extra $1.12 to get it delivered.
Officeworks is selling for $17.88 https://www.officeworks.com.au/shop/officeworks/p/amazon-ech…