Another option, though still expensive, is to use the Google Earth Enterprise tools. They basically let you build your own private Google Maps though this too r

Another option, though still expensive, is to use the Google Earth Enterprise tools. They basically let you build your own private Google Maps though this too runs into some problems. 1.) Imagery, 2.) Cost for GEE ($10k I think), and the cost of maintaining your own servers to host it on. I think it's still cheaper than going over the 20,000 free, but not optimal either.