Limit budget for marketing (something in the range of $0 to $50 per month)?
Here are various ways that small businesses can still market themselves. Some of the specific ideas include: using a Local SEO Checklist for helping with local searches, capitalizing on the benefit of Google AdWords to maximize visibility, and using Alerts so that you can analyze your online presence. Other ideas mentioned are to use the benefits of question and answer sites, participate in relevant topic forums, creating short videos with some of the free production tools, using testimonials and of networking in person. You can substitute ingenuity and time for a larger marketing budget.
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Your Massive Guide to Small Business Marketing on a Budget