I feel like Facebook should pay me for what I say about them, but if you're interested in a particular area you can spend a very small amount and get a super-targeted ad on Facebook. You can target it to age range, zip code, you name it. Of course, you have to have a Facebook page first. And LinkedIn ads can bring you a more affluent customer; their ads are cheaper than Facebook's, ironically. And yes, you have to list yourself in Google's Places/Businesses index because it pops up above search results. It's a huge, impressive ad for free. I don't know if Kijiji is a thing where you are, but where I live they're the upscale rivals to CL.