Have you heard of the
One Dollar Diet Project? Bascially, a married couple of teachers sort of randomly decided to try to eat for a dollar or less apiece per day for 30 days, and blog about it. Might be interesting research for you.
Caveat, though - apparently one of their blog posts (long after the end of the project, so I think you can read that month's worth safely) has a tasteless photo of an unclothed actress taken from a PETA advertisement... Regrettable, and frankly senseless. You could probably disable images on your browser when you visit, to be on the safe side.
*ETA* To clarify about that icky photo - she's posed in such a way that you don't see anything you wouldn't see at the Miss America pageant, but I thought a warning would be... beneficial.