I have no problem with someone making a post in the For Sale thread with a list of stuff for sale, maybe with pics and links, then mentioning it in the individual forums. "Hey, guys, I'm selling some of Company X, check out this link to the For Sale forum".
People interested in Company X are often interested in buying Company X's products, and it's often easier to get the links that way than trying to search for them. If people used a standard abbreviation or name for each company, it'd be a different story, but it's a pain to search for "dyno", "dt", "d-t", "D/T", "dyno-thane", "dynothane",...
SH