How can Taylor Wilson can get the materials for nucler reactor?

I watched the TED presentation by Taylor Wilson, the youngest person in the world to build a nuclear fusion reactor.  But how did he get the material to do nuclear fusion?
 in the CNN article, there is the sentence "At 11, he started mining for uranium and buying vials of plutonium on the Internet."  I wonder if a citizen like the boy can get the materials so easily? certainly, he did 'uranium mining'  and he present the site he was mining using Google maps on Taylor's website. as for plutnium? at least, I wasn't able to find person who sell plutonium on e-bey. I think that anyone who deal with plutonium need to gain a permission from the government in USA. I'm not sure How he get it.