I made an extension to facilitate buying on Amazon according to unit price, so you get the most for less.
This is superior to just buying the cheapest (or most expensive) possible item. And you can just focus on quality from that point.
I'm still developing this. My next update will include normalization of weights, volume, and length. Right now it's comparing lowest by individual units. Available for Chrome and Firefox! I will update it sometime this next week.
Chrome: https://chromewebstore.google.com/detail/amazon-unit-price/aggicbiihjlccnmafankkdfemoandjkj
Firefox: https://addons.mozilla.org/en/firefox/addon/amazon-unit-price
by No_Bee6488