When purchasing Gao Yi PVC roofing tiles, you should prioritize contacting the brand directly or large distributors. Obtain their contact information through their official websites or online searches to ensure a stable supply, a complete range of specifications, and customization options. Attending building materials trade shows is another effective approach, as it allows for face-to-face discussions regarding distribution policies. Provincial distributors in southern markets often offer flexible payment terms and logistics support. For first-time collaborations, be sure to request samples to test the quality.