Machine--Parts.Com is a moderated newsgroup (also known as a discussion list, devoted to exchange and interchange of complete machines and parts.
The fee for joining the list is $25 annually, to be remitted by credit card or check. There is no fee for vieweing the archive of this list, seen below, as this is a way to acquire prospective customers.
The charter of this newsgroup implies that brokers and third parties are not allowed to submit any ads.