When may amateur radio operators use their stations to notify other amateurs of the availability of equipment for sale or trade?

Amateur radio cannot be used for commercial purposes or conducting regular business. The FCC strictly prohibits using amateur frequencies to run a business, make a living, or facilitate the regular sale of goods. However, the FCC does allow a common, practical exception: buying, selling, or trading used amateur radio gear with other hams. You are allowed to announce equipment for sale or trade on the air as long as it is specifically amateur radio equipment and you are not doing it on a regular, commercial basis (like running a storefront or a side business). Options suggesting it is "never" allowed or require "no profit" are too restrictive; making a profit on a used radio is fine as long as it is not a regular business. Selling non-radio equipment or doing it regularly violates the non-commercial nature of the amateur service.