Need some ideas for items i should sell at school i buy off ebay for profit?

I'm 14 and want to start making profit. I wanna get around 50$ or at least 40$ a week making profit off ebay. So far i'm ordering phone cases and iphone external chargers. I bought them for less than 5 $ and i think kids will buy them for more than 15. But i need more ideas. I can't think of things that kids would want. I would buy things like knifes and lighters because those are my favorite and i would buy em my self but i'm ordering at my parents mailbox and don't want them seeing me order that sht. So give me some ideas please

Well bro you could try selling gum. But a really good idea is dvd's buy them on ebay for like 2 or 3 bucks free shipping and then sell them at your school for 5 to 6