here is a $100.00 core charge in addition to the sell price of this unit. EXCHANGE IS REQUIRED, WE WOULD MUCH RATHER RECEIVE YOUR CORE THAN KEEP YOUR $100.00. You may opt to send your core in first. We will not ship this item until we either receive a $100.00 core charge or the core from you. Because this is a special item, some lead time may be required. Please call or message us for more details.