Price your own things, and nobody checks or comments
Bringing
Anything sellable, from nine on the morning. Price it yourself with the labels on the table and put it wherever there is room.
Buying
Whatever is there. Money goes in the tin by the door and nobody watches it or gives change; there is a bowl of coins for that.
Afterwards
Take home whatever did not sell, or leave it for the charity shop collection at four. Both are equally fine.
