Heres a few options beside the typical restaurant gig on the side:
CNA Certified nurses aid. There is a state licens involved but you can read the book on your wn and challenge the exam, if interested I can get you the site with info. Its not selling your bodily fluids but it sure is dealing with others. Agencys tend to start at over 10 an hour and are very flexible with shifts. You can tell some when your available and theyll give you a shift if they have on, or othes will cal you as needed and you say yes or no.
Stagehand: Hard to get into at times especially if you dont have connections but I used to make upwards of 25 an hour freelanceing and takeing gigs occasionally. Find a local community theatre and volunteer for a few days to learn your way around backstage, its really mainly basic carpentyr and electrician stuff unless you get into sound mixeing.
Companies like laborfinders: Supply day labor mostly but they do have professinal positions in offices and the such, pay depends upon the job...... I dont know about up here but I know in west palm guys yoused to get like 5 dollars a sheet for hanging drywall. Backbreaking work but I know some guys that made a killing at it.