You can buy pure nicotine from various sources, including online retailers, chemical suppliers, and specialized laboratories. Some companies sell pure nicotine for various purposes, such as e-liquids, pharmaceuticals, or research. Online platforms offer a wide range of options and may provide convenient shipping options. Ensure to purchase from reputable suppliers to ensure product quality and safety. Additionally, be aware of local regulations regarding the sale and purchase of nicotine, as it may be subject to certain restrictions in some regions.