Are there anything like donating plasma?

I am student so I don’t have time to do surveys all day. Plasma is perfect because it is stable income as long I do it. What other ways to earn money? I am looking into Instawork, but all jobs are at least 100 miles away. I am not sure how to earn extra side money that is stable. I tried delivering food, but I live in a dead city, I can work 8 hours, and plasma earn me more money in a day.