How can I find quick work to make some money (legitimately and in person, not online) in NYC within the next week?

Please help me with advice (please don’t derail with joke answers). I’m putting so much effort into finding work; I really need to see if there are possibilities beyond Craigslist for IMMEDIATE work (show up somewhere, do something, take home either a check or cash the same day).

I have no points against me in terms of working—I’m a U.S. citizen and clean as a whistle criminally (never even a parking ticket). I have some fairly nice-looking clothing, like a long-sleeve shirt and a nice skirt, but I don’t have access to business attire and I can’t buy any (no cash). I don’t know if it matters in this context, but I have solid office, computer and touch-typing skills. (I’m not skilled in any trades such as carpentry or other typical day labor.)