Making an elastic band - sewing contractor

Hello,
we are looking for a company that offers contract sewing. In Poland, Bulgaria or Turkey. We need a small accessory made of elastic webbing in high quantities. It has to be sewn with two simple seams. The material will be provided by us. Sometimes 10,000 pieces are needed and sometimes 100-500 pieces (with special branding). The standards for the cleanliness of the details are high. I look forward to your feedback.
Best regards...