Syag, I did a lot of research on this topic recently because I was looking for an online graduate program that I can afford. What I came up with was that while there are no grants for graduate school (as far as I could tell), there are student loans. Depending on the yearly cost of the program, you can get enough money from student loans to completely cover the costs and in many cases, there is enough money left after paying for the courses for you to live on.
You can usually get up to $20,500 a year in student loans for graduate school, so you have to make sure that the cost of the program is no more than that per year. Most online programs are. You also have to double check with the financial aid office of the school in question to make sure that you will be allowed to take the full amount since some schools have their own limits.
Taking out loans is scary, but they have really good income- based repayment plans nowadays. If you are poor, you only have to pay back a little bit per month, and the remainder of the loan is forgiven after 20 or 25 years. The one catch that I found was that you may have to pay taxes on the amount of the loan that is forgiven, so that has to be looked into (since after 20-25 years, there can be a lot of interest, so the taxes on that might be very high).
In any case, if the degree will help you to earn money, it is probably worth it.
What field are you looking into? Depending on the field, I may know of programs. I am currently doing Touro’s Master’s in special ed. online. I chose Touro because it was the least expensive program I could find, and the loan money was enough to cover the courses and support me while I am in school.