Overseas Traveller Health Insureance OVHC subclass 600 visa Condition 8501

I have to get OVHC Health insurance for my parents in law who are visiting for 12 months from China. I’ve only found Allianz to offer this cover and it’s not cheap. Anybody know of other health insurance companies that offer OVHC that meeting the 8501 Visa Condition?

A simple Google search shows many health insurers that offer OVHC insurance for temporary visitors. Search terms OVHC and visa 8501.