Here's the register talking about the last time China decided to flex their rare earth monopoly; https://www.theregister.co.uk/2015/09/02/western_worlds_only_ra

Here's the register talking about the last time China decided to flex their rare earth monopoly; https://www.theregister.co.uk/2015/09/02/western_worlds_only_rare_earth_mine_closes/ https://www.theregister.co.uk/2015/09/02/western_worlds_only... Here's the same commentator more recently; https://www.theverge.com/2019/5/23/18637071/rare-earth-china-production-america-demand-trade-war-tariffs https://www.theverge.com/2019/5/23/18637071/rare-earth-china... Basically, yes, you can make them without Chinese rare earths, and it won't break the bank. You can just dig them up and process them elsewhere.