You do have various options, but as you say, the cost issue is what will determine the final decision. Many online schools will work with you for financial aid, if that is a consideration for you, or check with your job to see whether they have a tuition reimbursement plan.
Go here - this site appears to have VERY complete listings/links.
http://www.college-scholarships.com
http://www.college-scholarships.com/ssac.htm