Fundraising HELP!!!!!!!!! 10 POINTS?

I need to sell 20 boxes of cookie dough by June 6th or I'll have to pay back $6 dollars for every box i didn't sell. The cookie dough runs for $15 each. How can I sell 19 boxes by June 6th??? Any ideas,tips,etc? I've already sold one box over the two and half weeks we've been doing this. Sad! : ( Please I can't afford to have my parents pay back $114 dollars ( Im in cheer and its waaaaay expensive, this is what the fundraiser for) . Thank You! A detailed scheme would help! No one is really willing to help me out with this cookie dough. Please help me!