Finding a business card printing manufacturer can depend on your location and specific requirements. Here are a few general tips on how to find business card printing manufacturers:

1. Online Search: Use search engines like Google to find business card printing manufacturers. Include your location or the location where you want the cards shipped to in your search query. For example, "business card printing manufacturer in [your city/country]."

2. Trade Directories: Explore online business directories and trade platforms. Websites like Alibaba, ThomasNet, and Made-in-China.com list numerous manufacturers. Be sure to check reviews and ratings to ensure the credibility of the manufacturer.

3. Local Printing Companies: Contact local printing companies or print shops. They may either provide business card printing services or can recommend manufacturers they work with.

4. Networking: Attend industry events, trade shows, or networking events where you can meet professionals in printing and related fields. Networking can lead you to reliable manufacturers through word of mouth.

5. Professional Associations: Check with professional associations related to printing, graphic design, or marketing. They may have directories or recommendations for reputable business card printing manufacturers.

6. Online Printing Platforms: Explore online printing platforms that connect customers with printing manufacturers. Companies like Vistaprint, PrintPlace, or Moo allow you to design and order business cards online, and they work with various printing facilities.

7. Ask for Samples: Before making a bulk order, ask for samples from potential manufacturers. This will give you an idea of the print quality and material used in their business cards.

8. Quality Assurance: Inquire about the manufacturer's quality assurance processes. A reliable manufacturer should be able to provide information about the materials used, printing techniques, and quality control measures.

9. Customer Reviews: Look for customer reviews and testimonials about the manufacturer. This can give you insights into the experiences of other businesses that have used their services.

10. Check for Certifications: Ensure that the manufacturer has necessary certifications for quality and environmental standards. ISO certifications, for example, can be a good indicator of a manufacturer's commitment to quality.

Remember to communicate your specific requirements clearly, including the design, quantity, material preferences, and any additional features you may need. Obtain price quotes from multiple manufacturers to compare costs and services before making a decision.