If you learn CPR and First Aid, you just might save a life. Credit: Shutterstock

49. CRP and/or First Aid Certification: $25

There are many jobs out there that require you to be certified in CPR and First Aid, including professional nannies and lifeguards. Even if you do not plan to get a job that requires the certification, you never know when you may need to save someone’s life. The American Red Cross offers classes for $25 each. So for a total of $50, you can learn both skills, and add it to your resume.