If you're looking for an easy way to make a few hundred dollars per month outside or your job, donating blood plasma may be a great option. You're not going to get rich getting paid to donate plasma, but an extra $300 - $400 per month can have a huge impact on your finances.
One of the reasons this is such a great way to make money is because just about anyone can do it. As long as you meet the age, weight, and health requirements (which are pretty simple) you can make $20 per hour or more for donating plasma.
This article includes a lot of information from Melissa. Melissa and her husband donated plasma for several months in order to pay off debt.