Building links is an important part of ecommerce. In order to get your site listed organically in Google and others you must have high quality links. First you must use your keywords to find sites like yours (non-competing of course). Let’s say you sell fly fishing gear. You do a search for fly fishing and there are thousands of links. A little trick to use is to search the with the terms “fly fishing” + “add a site” (or add a link, link here, etc.). Once you do this you limit the sites listed to just the ones that may accept link trades or maybe even a directory. This trick makes quick work of link building.