I'm now selling small uranium and thorium samples in laser-etched bottles on ebay. I made them myself on my new laser cutter.
The thorium samples are thorite - a naturally occurring ore.
The uranium samples are small fragements of "radioactive red" Fiestaware - mid 20th century dishes that used uranium oxide for color.
The latest batch includes the entire decay chain of the respective elements on the back:
Ebay rejected my first auction - claiming I was selling hazardous materials - but they seem to be OK now that I've added some additional text quoting postal regulations.