About Express mail service values (EMS), I need to supplement the information.
I have found that the EMS values are different depending on the continent recipient, so for packets up to 500 grams the values are as follows:
America - usd 50 (usd6 paypal fees + usd44 post office)
Europe - usd 60 (usd7 paypal fees + usd53 post office)
Asia - usd 77 (usd9 paypal fees + usd68 post office)
Note: Paypal takes 12% of the monetary values transferred, 7.4% referring to payment fee + 4.5% on currency conversion.
For other package weights, you will need to consult.