I trust this will find you well. My further investigation up to now shows as follows:
1)In case of any manufacturers, they will purchase used shield machine in other countries maybe in China. Then key equipment will be obtained from the used machine and they will totally rehabilitate the key equipment, while all skin plate shall be made newly in which rehabilitated equipment shall be installed. Major parts are totally brand new with some used parts and equipment which price shall be about 70% of the brand new machine. This is not competitive, I think.
2)If you really like to have another used machine in competitive price, I will try to look for another solution.