Thai Cargo Service To Australia

Hello,

I'm looking for some cargo services from Chiang Mai (Bangkok if there are none in Chiang Mai) to Brisbane, Australia.

This is to export personal belongings, not for business purposes.

Does anybody have some suggestions, experiences, and know how much I should expect to be paying? When I left, there was a service at the airport that would send over belongings on planes that had spare space. Thus, they couldn't guarantee a day of arrival, but that it would be within a certain time frame. Any reputable services like that here?

Thanks