There use to be a thing called YELLOW PAGES where you buy an add and for sure at least you know eventually you will get calls, boy I miss those days!
Me too!
Like I was saying, you need to 'target' your ads now.
Social media is probably one of the best ways to reach your targeted customers besides paying for TV placement or radio ads.
Youtube also has potential because it offers company profiles and ad revenue on your videos.
You can also set up webpages which offer incentives when people click on your ads.
Smart phones put an end to the physical yellow pages but there are
online yellow page apps which do pretty much the same thing.
There are still newspapers and free circulars like pennysaver where you can buy ad space. You can join forums and online communities which favor your product.
If you look around on the web I'm sure you will find many apps which you could use.