Other car-related forums that I participate in have a sub-forum where members can post ads that they've seen for cars for sale on Craigslist, Kijiji, Autotrader, eBay, etc.

RX-7 forum members might want to post ads that they've seen elsewhere for the benefit of other RX-7 forum members who might be looking for an RX-7 for sale. If you're looking for an RX-7, it might help if there's a bunch of people also looking for you and posting ads that they've found.

The current "For Sale" sub-forum would not be an appropriate place to post these ads because the poster would not be not the seller.

And discussing the cars for sale and the prices that are being asked is always good fun.