There is some funeral insurance such as Cigna Funeral Insurance or the AA Funeral Plan. Both of them advertise extensively as the best funeral plan but it's up to the consumer to choose from. Cigna Funeral Plan is one of the best funeral covers.
https://www.funeralinsurancenz.co.nz/cigna-funeral-insurance-aa-funeral-insurance-nz-state-insurance-funeral-insurance-ami-pinnacle-others/