Suggestions for travel insurance (Perth)

Hi All - My husband and I are American citizens living in Perth under a Protected content visa and hold private health insurance. We need to make a trip back to the US for two weeks at the end of August and want to purchase travel insurance. The company through which we have our private insurance does not offer travel insurance for non-permanent residents of Australia. Does anyone have suggestions for reasonably priced travel insurance or tips on a good resource for doing comparisons? Thanks.