get a job where you get tips, im 18 so ive got no great job experience, but over the past 2 summer i deliver flowers..yeaa go ahead make fun..but anyways i made 7 a delivery plus tips which was usually a dollar or 2 a person, most days i would get about 5-8 deliveries that took an hour of 2 at most and maybe a gallon of gas. i made 4 k in 2 months this summer doing that everyday. plus on mothers day in 6 hours i made over $600 plus tips. just find quick part time jobs that pay under the table.
if your in college burned DVD's sell real quick for 5-10 a DVD and you make 4-9 dollars each one you sell.
i would also go around to places where people have Help Wanted ads, just find a oddjob like painting a garge, it takes a day or 2 but i got 300 from that because the "real" painters wanted 500
simply find a market that involves oddjobs like lawnmowing, leaf cleanup, painting, of apartment fixup and talk to the people, most of the time they post the ads just to see if they can find someone to do the work for less than a company would.