Customs are going to charge 24.75 on imports over $50 in value.
So, if you import 2 cd's with value of $50 ( i think it includes shipping fees when calculating price), customs will bill you an extra $24.75.
Apparently to cover their costs.
Check their website for details. It is a bit confusing, they say they will also charge a biosecurity fee of $12.50, not sure if this is on top of the $24.75???