"Big Name" Fundraising Companies?

Hello. I was chosen to represent my school at the Congressional Student Leadership Conference in Washington, D.C. The cost is around $2,500........I really need some fundraising companies.......Ones that are really well known and sell good items....Exs. Hershey, Mars, Zap a Snack, Cook's Collection, Auntie Annes........Anything that people will want to buy.......Thanks