Good news! There are grants available, but don't limit yourself to just nursing grants. You don't need to be 18 and single either (I am 30 and married). I go to a community college and for the past four semesters I have been receiving a returning student scholarship which has covered the cost of my tuition. The scholarship is for those who have been out of school for at least 4 years (I think; The time criteria may be longer). There was also a new beginnings scholarship offered with similar criteria. These scholarships are designed for older students. There are also book scholarships available and grants that target specific nationalities/ethnic groups/and women. My advice to you is to go to the financial aid dept. at the college you attend. They will be able to give you forms to fill out for any scholarships that you qualify for. I would also talk to a nursing instructor/advisor because they are often aware of the nursing specific scholarships that financial aid may not know about. I live in IL and we have grants that are given through the IL Dept of Health. I may be wrong, but I think these grants do not need to be paid back as long as you work in the health field for two years. The nursing instructors/advisors would know more about this and can tell you if your state offers something similar. Some hospitals also give grants if you agree to work for them.
Fill out all the applications for grants that you can to increase your chances of getting one. Good luck to you!