阿曼采购需求：带阀门和拉链的咖啡袋，平底咖啡袋，可重复密封咖啡袋

I'm excited to develop my specialty coffee brand and am looking into your coffee packaging options. Before moving forward with a bulk order, I'd love to get samples to evaluate the quality, materials, and color options, as well as the details on the zipper and valve features. Specifically, I'm interested in bags for different weights and would prefer a matte finish. Could you please provide the sample costs along with shipping information? Thanks!