Foundations & Government
The Grants Information web page includes a compilation of Department of Education, government, and related agency grants. It is always beneficial to check once in a while, because so many grants expire without applicants.
The Bill & Melinda Gates Foundation has a web site dedicated to K-12 education with support for both students and teachers.
The Gates Millennium Scholars Program, funded by the Bill & Melinda Gates Foundation, provides outstanding African American, American Indian/Alaska Native, Asian Pacific Islander American, and Hispanic American students with an opportunity to complete an undergraduate college education in any discipline area of interest.
Check with your regional and state education department web sites.
The California Department of Education, for example, maintains a Grant Information section covering grants for everything from technology to nutrition education.
The LANL Foundation (an offshoot of the Los Alamos National Laboratory) provides support and small grants to local schools.
What foundations are operating in your region?
NSTA hosts a number of Awards and Competitions.
There are many, many sources for grant money and awards, both nationally and within your local area.