The biggest source is in the batteries of imported cars.
Secondary, or recycled lead, is readily available for all required uses in the US.
The electric motor in a Toyota Prius uses about 1 kilogram of neodymium in its permanent magnets. The Massachusetts Institute of Technology (MIT) says a wind turbine rated at 3.5 megawatts of electricity contains 600 kilograms, or 1,300 pounds, of rare-earth metals. - https://www.recyclingtoday.com/article/rare-earth-metals-recycling/
May be it will be worth it to scrap dealers soon to pick up old TVs and monitors.