Jack, Peter, I've shipped lots of stuff to Australia and never thought it was outragious. I use this firm.
https://www.parcel2go.com/
As it happens I'm getting some Norton (Big4) motorcycle parts made for a guy in Oz and a guy in NZ. So I just typed in a sample 5KG parcel 30x30x30cm and they're quoting just over 30 Quid.
I try to avoid buying stuff from the States. Shipping is usually expensive and we can also get hit with 20% extra VAT plus £8 for Parcelforce to collect the VAT
Ron