美国采购需求：钥匙扣、个性化金属钥匙扣、定制金属钥匙扣、金属钥匙扣、定制金属钥匙扣、空白金属钥匙扣

I'm reaching out to explore the possibility of creating custom hard enamel pins featuring designs based on state flags. I'm looking for pins that are 7/8" in size, with a total order of 5 sets. Additionally, I would prefer gold plating for a premium finish. Could you send me a detailed quotation including production costs and any minimum order requirements? I'm also interested in understanding your production timeline, available shipping options to San Francisco, CA, and associated costs. Lastly, please let me know about your payment terms.