Clintred wrote:
So United States postal service would be the cheapest option?
It is ironic that we all complain about airline bike fees when I've found that often airline cargo options for shipping bikes come in lower than the standard UPS, FedEx, etc. options. I've used AK Airlines Air Cargo services a number of times for shipping bikes back separate from an ongoing trip. The only issue is that they require drop off or pick up at their airport warehouse.
Hawaiian Airlines appears to offer similar services between HI and Brisbane or Sydney. Perhaps Quatas and other airlines offer expanded destination choices. If you have someone back home that can pick up your bike, this would work well for you. There may be short term storage options or freight forwarding partners available to help too.
https://www.hawaiianaircargo.com/ship/ratesandestimates/serviceroutes/international Using a 50# bike/bike box total on HA's general freight rate sheet it looks like $125USD from KOA to SYD or BNE:
https://img.s-hawaiianairlines.com/...=cb7b&sc_lang=en I'm reading the minimum rate as inclusive of the 23kg. If for some reason their interpretation is $125 + 23kg it looks like around $170 max.
Hope this helps!