The Dot Pot is found across Europe and after a bit of Google-Fu, we discovered it retails for about $75US. This pot starts out as a potty training chair and transforms into a stool once your child has learned to use other toilets in the home.
The bottom of the bucket is covered in thick rubber grippers which hold the pot in place during use and become a great foot hold when used as a stool. It's available in several different trim colors and you can find a list of retailers (many of which ship to the US) over at the Levier Group. Plus you can see a few more shots of the pot and its parts over at Varpunen (careful, baby cuteness to follow).
(Image: Levier Group)