Okay, I havent read the last few posts yet, but while I'm motivated: re MyUS.com
In talking to them, the service DID seem affordable:
* you can get a one-off-send plan for free
* I could ship to Australia for $19 USD, tracked (but not signature-on-delivery) in 6-12 days using 'FedEx Intl Connect' (To get signed you would need to use FedEx Economy ot Priority, or DHL Express)
HOWEVER, I then checked them on the excellent site ProductReview.com.au and a quick skim reveals
ATROCIOUS reviews.
Of course, there is always bias on review-sites: they tend to attract the very happy and the very unhappy customers.
But I will definitely read that for a heads-up about them (including possible further questions to ask the chat team) and will also consider other vendors.
(Indeed, Im open to suggestions!)
Now I will read y'all other replies!