With very little spoilers.
I purchased this 5-card retail pack of 2011 Upper Deck Captain America: The First Avenger for about $0.37.

It's much harder to find a hit card in a retail pack as seen in the odds comparison below:
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Memorabilia cards was inserted into 1:96 retail packs vs. 1:16 hobby packs.
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Autographed cards was inserted into 1:2,500 retail packs vs. 1:288 hobby packs.
Base Cards
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44

Col. Chester Phillips is appalled.
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75

Something has been located.
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77

HYDRA.
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78

Friend or foe?
Insert Cards
- P-3 Captain America (odds 1:2)

If you're a Nazi, this guy will find you.