Any member of the club in good standing can run FREE ads advertising the parts they sell for 3 months at a time. If they change their ads they can run the new copy another 3 months. Also, generally every other month or so the manufacturing fund runs a full listing of what is available.
Vendors can also buy ads if they want to and some have in the past. However since we reach less than 1,300 people an issue, the viewer rate (cost per 1,000 people) used by the print industry as a standard does not work out well.