First-time poster, long time lurker. This discussion piqued my interest.

If you have your own business, a very cost effective way of promoting it is to get a part-time job, (or 'side quest' in D&D parlance) that involves delivering something such as catalogues, phone-books or even takeaway food or a paper-round in the location where your business operates. You can easily slip in your own flyers or business cards in along with whatever you are delivering. The wage from the part-time job will easily pay for the extra printing and mileage costs. I do this and my p/t employer hasn't found out yet or even explicitly or implicitly forbidden me from doing this; in fact, my p/t boss is pretty wily entrepreneurial sort of chap so he would probably actually approve so long as I am still good at his job.