typically, we use official resellers like L3Harris -- https://www.harrisgeospatial.com/Data-Imagery
-- or Aerometrex, etc. They have online catalogues that make searching for imagery of specific locations pretty straightforward.
Note that most standard commercial licenses assume in-house/private use only and thus do not allow for redistribution of your compiled aerial or satellite imagery. You'll need to carefully check the respective EULA and, in most cases, request a custom license named something like "Simulation", or "Value-Added", or "Integrator", ... for a hefty surcharge, of course