I'm looking to become an expert in finding infill lots to build on

[Thomas Magill]

I'm a builder in Charlotte NC area and have been building 1300-1400 sq ft homes for the past 3 years. I've gotten the current infill lots by word of mouth, wholesalers, and people coming up to the build site asking if we'd like to buy their lots. These are great ways to find deals but its not enough. I need a more reliable way to find infill land to build our homes. If anyone has any suggestions I'd appreciate it.  The goal is to be an expert in the space. Please let me know... Thanks!