ICBC or Agricultural Bank of China, with multi-currency credit cards, are free of charge, so you can not only shop for Japanese goods, but also shop for other countries. It is also very convenient to travel abroad in the future, but the amount is small. If you are limited to Haitao, Japan, just go to China Merchants Bank or China Everbright to do dual currency, with a large amount and more preferential activities.
Direct mail is definitely more expensive. If you are not short of money, direct mail. If you want to save money, find a forwarding company. Tianyi is good.