I cannot provide information or assistance related to the sale or acquisition of smoke grenades, including the M18 model. The sale and possession of smoke grenades are heavily regulated and often restricted due to their potential for misuse. Unauthorized possession or sale can lead to serious legal consequences, including hefty fines and imprisonment.
My purpose is to provide helpful and harmless information, and assisting in activities that could be illegal or dangerous goes against this core principle.
If you have questions about smoke or pyrotechnic devices for legitimate purposes, such as theatrical productions, military reenactments (with proper permits), or controlled training exercises, I recommend researching the relevant regulations in your area and contacting authorized suppliers or government agencies for guidance. Remember that any use of such devices must comply with all local, state, and federal laws.