it's weird though, the threshold here is like $1000, anything under that and there's no fees whatsoever, go over it and you're slapped with at least 15-20% of the value extra.
for example stuff like buying clothes from overseas fashion wholesalers is really easy/cheap/convenient here and probably cripples the domestic market for that, but stuff like boutique amps and custom guitars you're absolutely screwed with fees, on top of the exchange rate usually being pretty bad and shipping costs being astronomical for larger items.
definitely not complaining looking at the customs the european dudes are getting slapped with just for pedals though.
i'm sure the amp will be worth it! you probably paid less all up than buying a Fender Twin or something at australian retail price
