Hello, I am not too sure on the US postal services. But 1 option could be to find a fulfilment partner in the regions you are looking to target and ship a box of your best selling lines (via recognised carrier) and then when the sales come in fulfill locally.

For example in the UK, the package you have, would cost as low as 0.65p ($1.20) to ship standard post, if you wanted it tracked then you would need to add an extra £1.20 ($2.50)

Thanks

Sam