After reading on here for years about things like the 9x12, ads on magnets, coupon books, directories, etc., I realized that most of what is talked about is business to consumer. So that got me wondering about similar avenues of business to business marketing. I remember years ago that businesses would sometimes get sent ads in their fax machines in a page that looked like Coffee News or something, with ads along the sides and little jokes or unique news items to draw them in. What exists today for businesses to market to other businesses en masse? There are lots of threads about cold walking in or cold calling or cold emailing, but that's all one person trying to market their particular marketing service (web design, seo, etc.) to businesses directly. But are there any means out there that are used for the web guy and the seo guy and the commercial cleaning company and printer and janitorial company and .... and.... and.... to market together to other businesses that could use their services? I've wondered about the value of starting something like that and wondered what already exists.