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
Raspberries? Oof I can't imagine great. But let's see.
https://www.walmart.com/ip/Great-Value-Frozen-Whole-Red-Raspberries-12-oz/10543665?classType=REGULAR&from=/search
$4 for 200 calories. So raspberries would be off the top at 2 dollars for 100 calories (just looking at nutrition label). Fresh has even worse.
Kumquat I can't find a solid price on, but given each fruit has about 13 calories, I can't imagine it's a good source of them.
So yeah those are for sure flavor and vitamin eats and not calorie eats XD