Here's a few places you might try out

these guys are one of our sponsors - they are great! They've got a male triathlete, who like you is a student - maybe try the you should have a woman too angle
http://www.nuun.com/users/athletes.html

Gu sports is pretty free with their sponsorships
http://www.gusports.com/html/sponsorship.htm

so is Cliff Bar
http://www.clifbar.com/play/athlete_sponsorship/

and these are just a few suggestions - any product that you use and like is a potential sponsor and many already have sponsorship programs in place.

Some might not give you money, but products go a long way to lightening your financial burden too.