Stolen from Reddit
https://www.reddit.com/r/dataisbeautiful/comments/1ftmkwt/oc_foods_cost_vs_caloric_density/
But I loved it. Also this has Shrimp removed, because it was on the OG chart due to an error and this is an updated version.
EDIT: Here is one for protein! https://www.reddit.com/r/budgetfood/comments/1fp2ytb/foods_cost_per_gram_of_protein_vs_protein_density/#lightbox
Where do they get cashews that cheap?
They said Walmart is the source... so off I go!
https://www.walmart.com/ip/Great-Value-Cashew-Halves-Pieces-27-oz/315393128?classType=REGULAR&athbdg=L1200&from=/search
Based on the nutrition label the container has 4,320 calories at about 10 dollars.
So 1 dollar for 400 calories, or .25 for 100.
But given they reference walmart and USDA it's very likely these are not accurate outside the US.