Upvote:1
First, where do you want to ship it? US? because if your home is in China or Europe it's not really the same.
A friend used UPS Ground or a similar service to ship from Japan to France, a good amount of things (bigger than a backpack I would say). And it was around 100 dollars, but it takes a long time to come.
I think airlines don't have that high prices, I remember seeing a $60 fee to add a big bag to cross the Atlantic. So I don't know what's your next destination, but you can think of shipping it to the place you fly from, then you take it with you on the plane. I think you have some time to pick up your shipping once it arrived (it might not be free though)