I have chronic kidney stones (over 100 at age 30) and would absolutely pay $2000 for a personal ultrasound. Often it is difficult for me to tell whether it is just a rough passage (extremely painful but not a medical emergency), or a large stone obstructing my ureter causing hydronephrosis (medical emergency). With a personal ultrasound, I would be able to look at my bladder and see urine flowing from the kidneys to rule out blockage and prevent a trip to the ER. Granted, I'd probably still have to go to the ER because it is difficult in the states (in my experience) to get access to adequate pain control in a non-emergency setting.