Economy Shipping (tracking or insurance at buyer’s request / expense).  This economical choice is sent standard US Postal Service without customs forms and most small person to person (not to businesses) envelopes pass without incident.  ONLY select it understanding your local regulations and that you may have deal with customs forms and/or pay duties and taxes later.  Stamp dealers in UK and Australia have made smallish purchases using this choice, and I’d guess they know more than I, but you accept the small risk that Border Agencies may delay and/or lose your items sent without tracking.  Otherwise, please choose / or request a more comprehensive shipping service.  

DUTIES

 Information from UPS website (August 2021), however UPS states: “provided AS IS, may not be current, and does not constitute legal advice. In no event shall UPS be liable for any errors in the information".

Canada Orders < $20 CAD there are no duties, but subject to GST or HST. If the purchase is of  US issues they are also excepted under NAFTA rules.

Australia appears to be duty / tax free for shipments < $1000.oo AUD

Germany appears to be duty free < 150 Euro.  But sales are not exempt from VAT

Japan appears to be duty / tax free for items < 10000.oo Yen

UK appears to be duty free for items < 135.oo GBP and VAT is 20%