1. Gold and silver dealers: go to reputable dealers or institutions such as banks, jewelry stores and precious metal brokerage companies, which specialize in metals and precious metals. These dealers often have gold bars of various specifications and purities to choose from.

2. Online metal trading platforms: Many online platforms provide trading services for gold and other precious metals. Through these platforms, you can buy gold bars online and provide delivery service.

3. Auction houses: Some auction houses will also auction gold bars, which is another option to buy gold bars. Understand the reputation and relevant rules of the auction house before participating in the gold bar auction. Gold bars are a kind of physical gold investment. The investment varieties in the gold market are mainly divided into physical gold investment and gold investment derivatives derived from physical gold. Derivatives mainly include gold futures and gold options.