Eat potatoes

The organic ones cost barely more than the regulars.  They cook up in a microwave four-minute flash, are easy to carry to work, and can be combined with any number of fancy extras, for those of you who need flavor.

It's the fourth largest food crop in the world.

And not terribly un-nutritious, though I found that I have to be pretty darn close to starving to want to eat them two days in a lunch-row, despite the fact that Americans do eat about a potato a day on average.

Mine are mostly in chip-form, though.  Actually, I hardly eat potatoes on purpose.

It's a cheap way to eat, so I'm trying.  I have 24 ounces of them to get through before all the eyes grow.

Bonus:  displaces salty oily processed chips in diet (but grants notions of "hmm, what if I sliced it up and fried it?" — because cravings are not abated by logic or full stomachs).