There is a difference between a college that offers online options for their students, and one that is entirely online. Entirely online schools tend to have a significantly lower standing, and their degrees tend to be held in much lower regard. This may be unfair, and the school may have a rigorous program, but if the reality is that their degree is not going to improve your chances of being found employable, then it is probably worth exploring other options.
Most regions have what are called community colleges, or 2-year colleges, with reduced tuition for residents. They can be great place to improve your academic transcript. Spending two years applying yourself at a low-cost community college can open up doors for you to transfer to a four year university. It is not unheard of for community college students to complete their four year degree at an Ivy League institution, so buckle down and take your classes seriously.
Many schools, even top-tiered schools, offer programs for non-traditional students. These programs tend to be oriented more towards returning students, and consequently their tuition is significantly lower. Explore options at your state school or at other four-year universities in your region. Ask if there are programs available for part-time students or "continuing education" facilities. Without dorming or other fees associated with being a full time student, these programs can often be a great low-cost option.
Many traditional schools have distance-learning programs. These programs allow individuals to take classes entirely online, while simultaneously pursuing a traditional degree from the school. When researching potential distance learning programs, or online universities, be sure to find out what school you will be graduating from -- that is to say, what it will say on your diploma. If the diploma is the same as the main school that the distance learning program is a part of, you may have found a worthwhile program. If it is a different diploma altogether, you may want to reconsider this option.