Concerning uranium ore - yes, you can buy it from Amazon (provided you have $39.95 to spare). And it's OK to handle without gloves. Just don't eat it! :
"With a half-life of 4 billion years, uranium is only very weakly radioactive. In fact, since uranium is a heavy metal, its chemical toxicity is actually more of a danger than its radioactivity. If you touch it directly with your hands, you should wash your hands afterwards.
You should not eat it"
https://www.amazon.com/Images-SI-Uranium-Ore/dp/B000796XXM