EcoDirect or specialized distributors US Solar Supplier that list major brands (JA Solar, Canadian Solar, Qcells, Trina) or directly contact manufacturers/OEM suppliers such as Weransolar, Rosen Solar, Nuukopower, and DS New Energy in China, who offer wholesale/factory pricing and customization for half-cut mono PERC modules. Key factors to check are power output (e.g., 410W-455W), cell count (e.g., 144 half-cells), frame/glass type, and international logistics capabilities.