Products bearing Beijing Olympics images are big business for China’s dedicated collectors As every December over last few years,retired teacher Li Mi in Beijing started to collect thick stacks of postcards sent by her former students from her mailbox in the weeks running up to the New Year. Products bearing Beijing Olympics images are big business for China’s dedicated collectors As every December over last few years, retired teacher Li Mi in Beijing started to collect thick stacks of postcards sent by her former students from her mailbox in the weeks running up to the New Year .