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I'm interested in purchasing 18 pieces of your product. Could you please provide me with the pricing details for this quantity? Additionally, if there are any bulk purchase discounts or promotional offers available, it would be great to know about those as well. Moreover, I'd appreciate it if you could include information on the lead time for delivery, payment terms, and any applicable shipping costs. This will help me make an informed decision and proceed with the order as soon as possible. Thanks!