Here are five ideas that could be very effective for you, both in cost and results.
Start doing press releases:
You can write a press release about almost everything - extra learning you've taken on, certificates and awards, new customers, sponsorship taken in the community. Try to spread the word and be a better marketer.
Start writing articles and submit them to industry periodicals and publications your target market reads:
Articles, or comments and quotes by you in articles, work so much more effectively than advertising. If you write an article that gets published in your target market's periodicals, you're almost endorsed as an expert, and you get your name seen by many new pairs of eyes.