Short answer: An insurance policy guaranteeing deposit payment. Not widely accepted in NZ. Cash is preferred.
A deposit bond is an insurance policy that guarantees you will pay the deposit at settlement. You pay a small fee instead of tying up cash. Not all sellers accept them. They are more common in Australia than New Zealand. Most NZ sales require actual cash deposits.
Deposit Amount: $30,000
Bond Fee: $300-$600 (1-2%)
Cash Alternative: Pay $30,000 upfront
Nz Common: Cash deposit standard