坦桑尼亚采购需求：温室管道，镀锌管

I'm looking to source greenhouse pipes with a diameter of 25mm. It's important that these pipes meet our quality standards and are durable enough to withstand various environmental conditions. Could you provide details on the available options, including material specifications, pricing, and any bulk order discounts? Additionally, I'd appreciate information on your lead times and shipping terms for these products. Thank you!