I was surprised to learn that the largest continuous magnetic field created in a laboratory is only 45 tesla. That isn't very much more than the 2 tesla field found in consumer loudspeakers. The record-holding 45 tesla magnet at the National High Magnetic Field Lab is serious Big Science. They have 300 scientists, 370000 square feet, and the magnet takes 48 megawatts of power to run. It's a billion dollar project. Somewhat higher pulsed fields have been produced: the record non-explosively produced field is 100 tesla at LANL. So, a billion dollars only buys you 50x more magnetic field than you can buy for $10. That's a much worse ratio than other things. For example, the National Ignition Facility (costing $4B) creates 500 terawatt laser pulses concentrated down to a millimeter area. In consumer equipment, $100 gets you maybe 50 mW of laser light if you don't care about safety. Since the electromagnetic field of the laser light is proportional to the square root of power, the NIF achieves 100,000,000x as much as consumer lasers. That's more impressive.