In debt in my h.s. senior yr....HELP!!!!?

im a senior in h.s. and i owe $35.00 for 2 school bks, then $52 for candy box money. im tryin to figure a way to get that money back asap or else i wont get my cap and gown in the start of May. i was thinking of telling my parents that im goin on a trip to a banquet with my school, but i dont know any banquets in queens. so thats out of the question. how can i get the money back w/o telling my parents i owe a huge debt and gettin in trouble? also wat catches ppls attention on craigslist so i can get money to pay my debt? wat can i sell?