1) Calculate each order's total profit (product selling price minus
wholesale price). If order is less than X amount (e.g. $8.00), flag it
under status "Red order. In-house delivery only."
2) Need to be able to specify the X amount somewhere in backend.
3) Add the line "Total Profit" below "Total" in the order details page
(like what you did for paypal service fees)
4) Special condition: If shipping fee is charged to the order (e.g.
order is less than $200), do not flag the order.