Collect pop cans and return them for deposit. The following states currently offer this type of program: Michigan, Maine, Vermont, California, Oregon, Iowa, New York, Delaware, Massachusetts, and Connecticut. If your state doesn't offer a deposit, try recycling them. Many recycling centers will pay per set number of pounds for returned cans. Don't have cans lying around? Collect them off the street or better yet, throw a party. Recycle all the empties left behind.
In addition to psychology studies, Universities that have medical schools/biomedical research departments often seek participants for various studies. I used to work for an institution such as this and often took advantage of participating in some of these studies. Some studies have specific criteria that must be met in order to be a participant (age, gender, etc.), but if you qualify for one, it is a great way to pick up a few extra bucks.
I participated in several speech perception studies where all that was involved was listening to recorded language sounds and then recording what I perceived them to be. Also did a blood pressure study by just wearing a 24-hour monitor for a couple of days. Kind of fun and easy $$ :-)
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