Moving music stuff back to France

Hi,
I need to send :
- my electric piano (package size and weight : 138x50x17cm, 20Kg)
- and 2 speakers (each package : 47x37x31 cm, 10Kg)
from Beijing back to France, could you give me an average of the cheapest shipping it would cost?
If I go for : Large Package > SURFACE, I've calculated a total of around 1000 yuan, but I'm wondering if some expenses aren't considered here.
Thanks in advance.