If you are looking for manufacturers that specialize in in-shop branding, you may want to consider companies that offer a range of services related to signage, displays, and promotional materials. These manufacturers typically work with businesses to create customized branding solutions for their physical locations. Here are some steps you can take to find in-shop branding manufacturers:

1. Online Search: Start by conducting an online search using keywords such as "in-shop branding manufacturers," "retail signage manufacturers," or "retail display manufacturers." This should provide you with a list of companies that specialize in this area.

2. Trade Directories: Explore industry-specific trade directories or platforms that list manufacturers and suppliers. Websites like Alibaba, ThomasNet, or industry-specific directories can be useful in finding manufacturers that offer in-shop branding services.

3. Networking: Attend industry trade shows, conferences, or networking events related to retail, signage, or marketing. These events often bring together professionals and businesses in the field, providing an opportunity to connect with potential in-shop branding manufacturers.

4. Referrals: Ask for recommendations from other businesses in your industry or network. If you have contacts who have undergone in-shop branding projects, they may be able to refer you to reliable manufacturers.

5. Local Print and Signage Shops: Visit local print shops or signage companies and inquire about their capabilities in in-shop branding. They may either offer these services themselves or be able to direct you to manufacturers who specialize in such projects.

6. Online Platforms for Freelancers and Agencies: Explore online platforms like Upwork or Fiverr where freelance graphic designers, marketing agencies, or branding specialists offer their services. Some of these professionals may also have connections with manufacturers or can guide you in the right direction.

7. Review Portfolios: Once you identify potential manufacturers, review their portfolios to assess the quality of their work. Look for companies that have experience in creating in-shop branding solutions for businesses similar to yours.

8. Request Quotes: Contact multiple manufacturers to request quotes for your specific in-shop branding needs. This will help you compare costs and services before making a decision.

Remember to consider factors such as the manufacturer's reputation, experience, portfolio, and the ability to meet your customization requirements. Additionally, inquire about their production processes, materials used, and installation services if applicable.