People usually post information on Plurk or Facebook groups, and then they use 7-11 or FamilyMart’s digital sales platform to ship their packages to convenient stores. Some people also buy them off of eCommerce platforms like Shopee, but the fee is higher there.
woonding: yes, but it's not convenient to browse other stores from there, or can’t. You can search #棉花娃 or #賣棉花 on plurk and you will see sellers who want to sell dolls or clothes post their own stores here.