Healthy food on a tight budget

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I will add one suggestion to those made here: farro. It's a grain typical of Italy. Cook it like rice... 25min or so, with 2 cups of water (or broth) to one of farro. I make "salads" that I take for lunch at the office (I do the same with quinoa). Two very easy ones:

• roasted Brussel sprouts, golden raisins, and farro with some grated pecorino romano. Salt to taste.
• tuna, capers, chopped tomato, farro, with olive oil and lime, salt and pepper to taste.

It's very high in protein -- one cup has 12g of protein (I think quinoa has about 8g), and I find the taste very pleasant whereas the nutty taste of quinoa tends to tire me.

PS: I find farro at Whole Foods and Italian delis.