You can't. According to the announcement issued by Chengde Shangbancheng Prison Administration, since April 2023, prisoners in Chengde Shangbancheng Prison can spend money at will, and spending money is restricted. Criminals are not allowed to buy prohibited items and engage in improper activities, and their monthly expenditure shall not exceed that of 500 yuan. Prison refers to the place where all criminals are held, including prisons, detention centers and detention centers. In a narrow sense, a prison refers to a criminal who is sentenced to death with a two-year suspension of execution, life imprisonment or fixed-term imprisonment in accordance with the provisions of the Criminal Law and the Criminal Procedure Law.