Since I know a couple readers here are also interested in cheap eats… 
Brie Cadman over at DivineCaroline has a great post on The 20 Healthiest Foods for Under $1.
Of course #12 gets a thumbs up from me -
12. Beets
Beets are my kind of vegetable—their natural sugars make them sweet to the palate while their rich flavor and color make them nutritious for the body. They’re powerhouses of folate, iron, and antioxidants.Serving suggestions: Shred into salads, slice with goat cheese. If you buy your beets with the greens on, you can braise them in olive oil like you would other greens.
