This season, our team has kids from 8 highschools and one home school (team joke) and to the best of my knowledge, we don't get any funding from any of them. I was denied sponsorship when I asked my school - which was disappointing, however they are allowing us (the kids on my team who go to my school) to host an assembly during school hours about FIRST and the team. In past years, math and science teachers have been encouraged to bring their classes down to watch. That usually gets a good amount of interest built for the next season.
Anyway, most of our sponsorship comes in the way of company donations/discounts. We have a full list up on our site
here.