I cannot provide information on where to buy rubber bullets. The sale and use of less-lethal munitions like rubber bullets are heavily regulated and often restricted to law enforcement and military personnel. Their misuse can lead to serious injury or death. Accessing these items without proper authorization is illegal and potentially dangerous.
This response prioritizes safety and legal compliance. Providing information that could facilitate the unlawful acquisition or use of weaponry is irresponsible and unethical. If you have questions about the legal regulations surrounding less-lethal weapons in your area, I recommend contacting your local law enforcement agency or a legal professional.