Things to Sell in School/Craigslist

This may sound shady but selling single cigarettes is an amazing way to make a quick buck in highschool.

 

Yeah. I would reccomend buying a pack and then selling the singles smokes.

 

Bottles of Water.

 

This would be a good idea^. If you don't have/want to spend much in the first place, buying chewing gum or bubble gum and sell them individually.

 

Drugs, stolen devices such as iPhones, iPod touches, mp3 players, designer clothes and shoes.

 

Back in the day, a friend of mine used to stock up on Frozen drink cups, and sell them in school for an inflated price. They sold like hotcakes due to the heat.
You may want to invest in cooling packs / freezer bags if you're thinking of cold items.