5x 457mm x 812mm pieces of Dynamat Xtreme for coverage of 1.85 m²
$9.95 shipping via their official ebay page
https://www.ebay.com.au/itm/Dynamat-19405-Xtreme-Trunk-Kit/2…
Dynamat 10007 Professional Heavy Duty Roller also on sale for $28
https://strathfieldcarradios.com.au/dynamat-10007-profession…
I use this stuff to line the inside walls on some of my arcade machines. Basically eliminates fan noise/coil whine.