Internet Advertising
Contrary to common opinion, the internet is one of the best methods for targeting an audience. You can target an internet audience by geographic location (as close as by zip code, or as broad as by country), by language, by age, by sex, by household income, by lifestyle choices (golf.com anyone?), by the words that they are searching for, by the content that they are reading or by the other websites that they visit.
You can advertise with text ads that appear when someone searches, with graphic ads that appear when there is relevant content on the page, by video ads that the viewer clicks to play, or with interactive flash ads that can allow someone to search your site without leaving their search page.
It's cheaper than most other mediums, it's more accountable and trackable than anything else, it can be directly tied to a return-on-investment, and it is very easy to test.
Isn't it time you tried it today?