While it may be called something slightly different at your college, all public (and most private) colleges and universities will have a department that is meant to assist you with pursuing your degree, and this includes finding grants and scholarships.
Don't forget to check with the financial aid department; there are often grants and scholarships available that are specific to the school and your disability.
The National Federation for the Blind and the Jewish Guild for the Blind both offers grants for those with visual impairments who want to attend college or graduate school.
Galludet University offers financial assistance through scholarships to its deaf students, while the National Association of the Deaf offers grants and scholarships to those attending other colleges and universities.
Many states offer services to their disabled residents. Kentucky's Department of Vocational Rehabilitation offers students grant money in varying amounts.
Some other grants are currently available from organizations, such as the Bubel/Aiken Foundation, the American Speech Language Hearing Foundation, the Clay Aiken Able-To-Serve Grants, and even the American Foundation for the Blind Helen Keller Foundation.