One of the ways I live by is writing and distributing articles. Write good contents on your niche market and distribute them to free article distribution directories. I would strongly recommend Goarticles, Ideamarketers and Ezinearticles for this purpose. This is an effective way of creating backlinks to your website thus, pushing your website up the search engine ranking. The next marketing tactic is mainly meant for product owners.
Striking joint ventures with other product owners of the similar work from home online business niche. A good place to look for potential joint venture partners is at Clickbank. Go to their market place and search for other product owners of your niche then write each of them an email requesting for a joint venture. It helps if you have a substantial mailing list to do cross promotions with.
The secret to a successful JV is to subscribe to the potential JV partner's newsletter. Read the newsletters and get an idea what kind of a person he is and the products that he promotes. Then send him a joint venture proposition after about two weeks but only if you feel good about it. Introduce yourself as his subscriber and how you enjoy reading his newsletters and that you have a product or service that you think would benefit both your businesses and suggest a JV.
Viral marketing is also a very effective and zero cost way of marketing your home online business. It has always been known as the online "word of mouth" marketing. What you do here is create good content pdf format ebooks to be distributed. Download Openoffice's free word processor software to help you with creating pdf files. Promote your website or products you are affiliated to in the ebook and include the rights for others to distribute it too. Why? The more times your ebook is being passed around the more exposure your business gets. Think about it. Can you see the power of viral marketing.
You don't have to spend a single cent to market your work from home online business with the tactics above. Having said that, you definitely can speed up the response to your promotional efforts with the paid options however, you can always do that after you have made the money.