Pure nicotine liquid is available from various suppliers and retailers online. It's important to ensure that you're purchasing from a reputable source to guarantee the quality and purity of the product. Look for suppliers that offer USP (United States Pharmacopeia) or EP (European Pharmacopoeia) grade nicotine to ensure it meets safety standards. Additionally, consider checking customer reviews and ratings to assess the reliability of the supplier. Always handle pure nicotine liquid with care and follow safety guidelines to prevent accidental exposure.