[*Cobber*]

One at a time costs more in freight. Swings and roundabouts.

I used to get performance VW parts may years ago from the US marked as aviation parts and no GST or duty was payable. These were for use in gyrocopters and a couple of gyrocopter powered VW drag cars. You work it out.
Not sure if this loop hole is still applicable.

Certainly a good time to buy.