Had a look around and cheapest i could find plus free shipping enjoy
Highlights :
*The Xiaomi Mi Car Air Purifier has a filter for PM2.5 particulate matter and a CADR (clean air delivery rate) of 60 cubic metres per hour which is capable of cleaning the average car's air in about 3-7 minutes. It consists of two-wheel mirror fan circulation system that expels clean air in all directions and comes with a silent mode so that you don't hear noise while on a call inside your car. It also includes a headrest strap that will let you fasten it to the car's headrest. As with its other air purifiers the new Mi Car Air Purifier can be controlled with the Mi Home app.
*Xiaomi car purifiers look similar to the previous air purifiers launched by the company only smaller in size.
this is a must have in china, not sure about aus though…