Worst: Protein Bars
If you had not yet tried the Costco signature protein bar, there is no reason for you to risk buying 40 of them. On top of that, the protein bars are sold at around $1 a bar. If you get a bulk order of Pure Protein bars on Amazon, you end up paying less because they will come up to only $0.90 per bar.

Protein Bars
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Worst: Whole Grains
Are you aware that whole grains come with oils? They are found in the bran and germ of the grain, which is why they can go bad in no time at all. This is also true for seeds and nuts. Even though the oils are taken out in certain grains, they can remain attached and make the food product go bad.

Whole Grains