There are many ways to do it.

One way to do it through more of a "growth hacking" method is to create a profile for your target customer, then build your own proprietary database of target customers by scraping data online.

Once you have contact info added to your database, you should be able to effectively build out a direct marketing strategy using a marketing automation tool such as www.close.io to help automate a high volume direct sales effort.

This will be the most cost effective strategy, but there are many other ways to do it too if you have a budget for customer acquisition.