Yep. Wealthy Canadians often come to the USA as medical tourists and pay cash to skip the queue at home for elective procedures like MRIs or joint replacements.
I think private MRIs have been around, at least in my province anyways, for close to 30 years.
Jesus... I can get a chest-abdomen-pelvis MRI on US insurance for less than half of that, and the lead time is measured in weeks at most.
I mean if you have insurance I don't know why it's costing you anything but regardless it's hardly surprising that you're cost is less than the person paying cash ?