As promised, here is a source for yacon. Another source Also provides a wide range of plants that you may not find in your neighbourhood nursery. If you are moving beyond simply growing your own food and giving some thought to the commercial potential of various plants, then the more you know about the plant, the better. Knowledge will make the difference between success and failure. In addition, to knowing about your choice of product, you need to be aware of the potential market for that product and how to reach that market.
Marketing is both a science and an art form.
The time you spend developing your marketing skills is time well spent. If you are planning to sell within your local community, find out if there are any community newspapers . The ads will not be that expensive and the circulation reaches your target market. If you have some writing skill, you may be able to provide them with a monthly column that relates to your business. This way you can generate your own market and create interest in what you have to offer the community.