Regarding people selling equipment to U.S.A. only

I am in Australia and find many things I would like to buy but mostly people will only ship to US or Canada.Is it very complicated to ship overseas? If I were to pay for some speakers and their shipping by bank transfer could the seller simply take the boxes to his local Fedex or the like or is it more complex than that.I am aware that there are some Paypal scams happening from the far east but if I were to deposit funds directly into the sellers bank account would this not make the transaction foolproof and risk free for them