Comment Shipito (Score 1) 206
I'm not in Australia (I live in the UK) but I have bought a couple of things from ebay sellers who would only ship to the US in the past few years (sadly this seems to be an increasingly common occurence). I've used Shipito for package forwarding for this and would definitelty recommend them - for my sort of low-volume use they worked out cheapest by quite some margin (as they have a plan where they don't charge you a monthly or annual fee, just a higher fee per shipment) and everything has worked out so far exactly as advertised. Although I've not really had any major issues, I've been in contact with their customer support team a couple of times too and that has been a good experience - they respond to emails/online form submissions pretty quickly.
One other tip - more relevant if you're not using a forwarding service though - I've found it's well worth paying for USPS Express rather than USPS Priority Mail for boxes as it's usually not much more money (often in the region of 5%) and is SIGNIFICANTLY quicker - we're talking a difference of 2-3 WEEKS, at least from the US to the UK and in my experience.