Here are a few posts from Kumamoto-i (the mailing list):

SELLING

A car (different from the one advertised here recently)
https://groups.yahoo.com/neo/groups/kumamoto-i/conversations/messages/12860

Various furnishings
https://groups.yahoo.com/neo/groups/kumamoto-i/conversations/messages/12859

Piano, furniture, etc
https://groups.yahoo.com/neo/groups/kumamoto-i/conversations/messages/12855

BUYING

Various household and electronic items
https://groups.yahoo.com/neo/groups/kumamoto-i/conversations/messages/12857