I concur with the other posters here. First, it really depends on what you would like to do. Do you want to do some vocational type training or just take a few courses to see if you can handle it? Are you looking for a specific degree program? Most community colleges and universities offer some online classes (the selection will vary by school of course), but the number who would offer an entire program online are much fewer.
Do you already have a degree in something? Or any college coursework completed? You don't have to read my long-winded examples (I'm really excited about my personal experience though!), but I'll just say that yes, it is absolutely do-able if you are committed to it AND you have the support of your family. I get mommy-guilt a lot (and I only have 1 DD) because I have to study instead of play. OTOH, I know it will make things better for us someday (like in 2 years and 23 days when I graduate!). You also have to be self-disciplined to get that work done and remind yourself that you're a student. If you'd like, feel free to PM me - I'm not on here too often right now, but I'd be happy to share more info.
I'll give you a couple of examples of my experience:
My sister had an associate's degree from a community college. She worked for a few years and decided to complete her bachelor's, which she did through DeVry University. She did it all online - never even had to visit the campus (I assume there was a campus as they had a graduation ceremony). She then decided to pursue her Master's (in Public Health) and she is doing it through Seton Hall University. She's online through the year but has to go to New Jersey once a year to do projects and presentations.
I got my 4 year degree from a traditional University. After nearly 10 years, I decided I wanted to go to pharmacy school. I took some pre-reqs online through the local community college - cost was the same as if I'd taken the classes in person. Some classes, I had to go to campus to take exams, others I did completely online. I am now almost done with my 2nd year of pharmacy school - online through Creighton University (they are the only accredited distance learning pharmacy school in the country). I do all my classes online (I'm listening to a lecture right now!) and I go to campus for 1-2 weeks each summer. (My 4th year is all rotations though - no online perks there). Tuition for the online program is the same as for campus. I work about 30 hours a week, my courseload is about 17 hours a semester, and I have just 1 child - it isn't always easy, I'll admit (it's never easy, actually).