Why does Amazon.com allow crazy prices?

I was looking for a bike helmet for our 2-year old son, and pulled up “kids’ bike helmets” on Amazon.

Amazon Kids Bike Helmets

Look at that first entry closely. Specifically, look at the upper bound on the price range.

Ridiculous upper bound on kids bike helmet on Amazon.com

Why would Amazon allow an upper bound price like that on such a simple item? Is it purely oversight, or is there some crazy psychological result that results in more sales when items are merchandised this way? Does anyone know?