I'm looking to compare prices on Amazon to some local retailers for protein supplement powder. However, ideally an answer would work for any product that is sold in bulk by volume or weight.
There are almost 1500 products in the protein supplement category on Amazon, many of which are different sizes/flavors of the same stuff from the same manufacturers. Since I use the stuff regularly, and lack any brand preference, I mostly just want to see a listing sorted by price per pound.
Is there a way to do that, either on Amazon.com or via some third-party tool or site that knows how to query their product database?