Cheap ramen noodle cups. Like, C H E A P. For the sake of example; did you accidentally spend too much on replacement drives or an upgrade and you only have 6 or 7 points to get you by? Cool, buy 6 or 7 ramen cups. Have a bunch of points and wanna stock up on food for a long while but don't wanna buy MREs or burgers? Well zippity-doo-dah, time to buy a bunch of ramen.
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The issue with cheap food like this is it would realistically have to be HEAVILY balanced around being super cheap in some way.
If it is very cheap but still fairly good, why buy any other food items outside of just convenience? If it is too expensive (about 8+ points), it is basically just any other average food item.
The two ways I can think a cheap food item like this could exist is either having to be prepared in some way that takes more time than an average food item (Cheaper but inconvenient or more expensive but simpler), or basically be something to just prevent you from starving, possibly horrible food tolerance (worse than MREs) so you can quickly get and eat it if you really need to but you can't just live off it for any decent period of time and have to invest in other foods.