See if your state has government sponsored grants for technology. Browse tehcnology websites to see if they have sponro programs.
Also, call corporations in your local area and ask if they have a grant application that you can fill out; its better to have local sponsors than random ones. And don't hesitate to ask anyone... our team had a bakery sponsor us a few years ago
And if all else fails, try and hold fundraisers... they might seem like nothing but sometimes they can bring in more money than grants
GL!