50% downpayment required for BACK-ORDERS.
For back-ordered items, we currently don't have them in-stock, but we can still order them from parallel suppliers in Japan/US/etc.
Pricing can vary depending on supplier/source.
Once the slot is sold out, we can:
1. find another source, 2. transfer payment to another order, 3. refund payment for back-ordered items.
"Backorder" is a common phrase in trade and commerce to mean to place an order for a product that is temporarily out of stock.
e.g. so something that is out of stock (in our warehouse/storage) for the time being needs to be backordered.