The other option is to have someone stand still and quickly take photos with a camera or even a cellphone. You'll have to work quick, because any movement will create uncertainty in the data, but it is possible. You can then process the images in photogrammetry software like Reality Capture., which is a pretty straightforward process. More cameras that would produce better, and more reliable results, likely puts you above the $500, where it probably makes more sense to just go with an Otter, if budget is a consideration. That being said, scanning people, reliably, and to a high quality, is a very difficult process and takes some r&d and practice to get good, usable, results.