Return of Purchase Order and Request for Advance Payment
Your purchase order has been referred to this department. We noticed that the third item on the order is [quantity and description] at a price of $[amount] each. While we appreciate an order of this size, the terms and conditions on page [#] of our catalog clearly specify that overseas orders are accepted with full payment in advance, and with an amount sufficient to cover shipping.
We are therefore returning your purchase order. Please resubmit your order with either a sight draft, or an irrevocable letter of credit. We anticipate shipping charges to be in the neighborhood of $[amount] U.S. per item ordered.
Thank you for your order. We look forward to serving you in the near future.