BetterRoaming does not provide an unlimited data eSIM for Oceania. The available plans for the region are fixed data plans with set allowances. For example, a 20GB plan is available for 30 days at $59.99 USD, and a 10GB plan is available for 30 days at $36.99 USD, both covering Australia, New Zealand, and several other Pacific countries.
Choosing a fixed data plan can be more cost‑effective for most travelers, unless the user is an extremely heavy data consumer who would benefit from a truly unlimited option.