Shipping out of country.

PCs and interconnects are all I’ve ever been willing to ship to other countries. As jl35 mentioned, sometimes the buyer will balk at the price declaration/insurance, BUT- that’s on them. USPS has provided the only realistic pricing, with their Flat Rate boxes and available insurance up-ticks. https://www.usps.com/international/priority-mail-international.htm and https://www.usps.com/international/insurance-extra-services.htm

In Brazil it's very simple. They find out value and it doesn't match declared -- the item repossessed and will never reach customer.
If you're sending some small stuff like watch or CD it's fine. For components and speakers watch out.

I have used either FEDEX or DHL or USPS to ship outside of the country. Costs vary widely. The issue of import duty is not trivial. Once when returning an item to a manufacturer for repair, I had to pay for import duty - even though I stated in the shipping documents that it was made in that country and that it would be shipped back to me afterwards.

I've had nothing but success using USPS, insurred and make sure there's a tracking number.

I have and have not had any issues Europe, England & Austrailia.