This data was from a Make Over Monday challenge. It shows the cost per 20 grams of each protein. One can compare different products. Additionally, the turquoise bars indicate those foods that are vegetarian. One can also filter the viz to compare only vegetarian options too.
Data Sources:
https://makeovermonday.co.uk/
https://lifehacker.com/the-cheapest-ways-to-get-your-protein-right-now-1850001760