Used to sell candy in middle school. Several other kids did this, but they only sold Airheads. I sold those, as well as hershey's bars, m&m's, skittles, and twizzlers. I'd also accept special orders, but for those, they had to wait up to 2 school days for it, and I charged extra. On average, I made at least $10 per day, though the business was slow at first. So I definitely made at least 1k. Would have been more but I didn't do this for the entire 2 years and there were days I didn't sell anything, either because I was out sick, or just didn't have anything in stock at the time.
I was basically a drug dealer, but with candy instead of drugs.