美国采购需求：铝箱，公文包，背包式公文包，铝制商务箱，铝箱供应商，中国铝箱制造商

I'm interested in obtaining pricing information for your cases. Could you provide me with the current rates, including any bulk order discounts? Additionally, if there are various models or sizes available, please outline the price differences among them. It would also be helpful to know the minimum order quantities and lead times for delivery. If you have any promotional offers or relevant details regarding material options or customizations, please include that info as well. Looking forward to your detailed response!