In India, you can book an appointment for MRI scans at private clinics the very same day or at worst within 1-2 days. Costs about USD 100 or lesser.

There is also this startup - https://qure.ai (Not my employer, I know someone who works there) which has already automated the report generation part for several classes of X Ray / CT / Ultrasound scans. This takes away the requirement of having a trained Radiologist to go through the scan and then create a report, which certainly helps in scaling the availability of such scans - you just need the machine and trained staff to operate it, and are not dependent upon having a doctor with a postgrad in radiology to write the reports.