I need fundraising ideas?

Ok, I'm a freshman (technically a sophmore cause in one day it'll be summer) but in my junior year I want to study abroad. I need 4000 dollars. I'm thinking of buying those cheap packs of gum under a dollar and then selling them for a dollar. Small profit. Or buying pops at my church for .25 cents then selling them for a dollar as well. But Idk if that'll get me to my goal. (ill definetly get some money, my school worships gum). Anyother ideas???? Please?!?!?!