A good place to look might be at your competitors. If your product is better, easier or cheaper then that might be a good source of potential customers as you k

A good place to look might be at your competitors. If your product is better, easier or cheaper then that might be a good source of potential customers as you know they understand the problem and already have/maybe pay for a solution. Here comes the non-shameless plug, BuiltWith TrendsPro might be a good tool to find these sorts of businesses.