You can get a Velodyne "puck", that is light enough for many drones, for around $7k. The problem is that the scan density is not that great, so for many applica

You can get a Velodyne "puck", that is light enough for many drones, for around $7k. The problem is that the scan density is not that great, so for many applications (e.g. archaeology) I suspect it's not worth it. Structure from Motion with good imagery can get some pretty good results these days.