There are a variety of sites where you can search for customized serum boxes for retailers. Another option is to look online for packaging companies or manufacturers who specialize in customized packaging solutions. It is also possible to contact local printing companies or packaging firms within your region to find out whether they provide custom packaging design and printing. Also trade shows and other events that are related to retail or cosmetics can offer opportunities to meet with manufacturers of packaging that are able to design and create customized serum boxes for your company. It is always recommended to ask for samples or a sample of their work prior to making a choice so that you can be sure that the quality and style are in line with your expectations.