这是一封询价信。FOB是free on board的缩写，意思是“船上交货”或“离岸价格”，quotation是“报价”或“牌价”的意思。
Our customer is in great need of your model 820 recorders. Would you please fax us a FOB quotation for 500 units.
The shipment of the recorders must be before the end of next month. Kindly inform us of your terms of payment so that we may arrange our purchase so long as your price is right.
Looking forward to your prompt reply.