Toothbrush heads for Oral B, price is 3.95 per head in recycled packaging as a plus. Don't know what the carbon foot print would be but apparently manufactured in Germany-MIG.
Das tolle Zähne.
https://www.electricteeth.com/au/best-oral-b-brush-head/#flo…
Cheaper by $10 if pickup option is selected, thanks to https://www.ozbargain.com.au/node/844071
Camel Camel
https://au.camelcamelcamel.com/product/B0BWNSJ2M6
As per the T&Cs: