Fundraising 1600 For Choir Trip to Ny?

My choir is going NY this spring and I'm trying to fund raise money for that trip. I'm trying ad books and selling candy. And so far I made 30 dollars for candy sales. And $ 25 for Ad sales. Can somebody please help me find a way to fund raise money for this trip. The next payment is this Monday, and it is $500. If you can tell me what types of businesses would do Ad's or just some tips. Even better, a easier, faster way of making more money. I really want to go to this trip, we're going to be singing at Carnegie Hall and this is really a once in a lifetime chance, anything that can help is welcome! Thank you