Generally around 4.5 yuan, not including the registration fee. Postcards sent abroad have nothing to do with the country. There are several charging methods according to different mailing routes:

( 1).？ Charge for airmail postcards: 4.50 yuan each.

(2).？ Charge for air mail and land mail postcards: 4.00 yuan each.

(3).？ Postcard fee for land and water: 3.00 yuan each.

If you want to register postcards of the above three postal routes, you will be charged a registration fee of 8.00 yuan each.

Extended data:

The format of postcards is very good.

The address and name of the recipient are written on the right side of the postcard (on the painted column)

The sender's address is also written on the right, after the recipient's address and name, and then on a new line, write the sender's address and name (if you use a private mailbox, don't write your name, if it is a public mailbox, it is best to write the recipient's postal code in the upper left corner and your postal code (of the postcard sender) in the lower right corner.

The sender's address can be written or not. If you are quite sure that the recipient's address is correct, you can leave it blank. If you are not sure, it is better to write it down for return.

If the words are written in the left margin, you don't have to write "Sincerely, Salute". If you and the recipient are close friends, you can write it like this, or you can use "I wish you good health" and "I wish you all the best".

References:

Baidu encyclopedia-postcards