That depends on the relative meaning of low cost. British people think it is fine to eat beans on toast when desparate and if you agree, that in the categlory of 'American Prison Food' I have an affordable option: 
Eggs with BBQ sauce and hotsauce.

List: Eggs and sauce if you really don't have anything

Eggs on a pan to fry, add BBQ sauce and or hotsauce around the time you would add salt and pepper.

4 Eggs is enough for you.

Price: 3-6$ depending on how brutal the conditions are near you.
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