As used in this article, unless the context requires a different meaning: “Authorized scrap metal purchaser” has the same meaning as provided for the term “scrap metal purchaser” in § 59.1-136.1. “Authorized scrap seller” means any licensed plumber, electrical contractor, HVAC contractor, or building and construction contractor. “Building material” means any secondhand heating or plumbing fixture or supplies, electric fixtures, or any wiring, gas fixtures or appliances, water faucets, pipes, locks, or any other secondhand fixtures of any kind or description used in the construction of a building. “Junk dealer” means a person who regularly engages in the business of purchasing, acquiring, or canvassing secondhand building material, including all nonferrous scrap metal, proprietary articles, or both, for the purpose of resale and has conducted transactions involving, or has offered for sale, more than 600 pounds combined weight of secondhand building material or enters into more than 26 combined transactions annually. “Junk dealer” does not include a “scrap metal purchaser” as defined in § 59.1-136.1. “Person” means any individual, corporation, partnership, association, cooperative, limited liability company, trust, joint venture, or other private commercial entity. “Regularly engaged” with respect to purchasing or acquiring secondhand building material means having conducted transactions involving, or having offered for sale, more than 600 pounds combined weight of secondhand building material or enters into more than 26 combined transactions annually.