I know how you feel, wanting to finish and get on with things. I am graduating a year early because I stayed through the summers, but think about the classes and experienced professors you will be missing out on if you take the "fastest way out" with an online degree. For me, that would mean a very valuable Mammalian Physiology class, along with immunology, histology, microbiology, etc... The more you can learn now, the better you will be for graduate school, and ultimately, the better you will be with your career. My advice, stay the four years, or continue through the summer and graduate a semester or year early, instead of taking the fast way out with an online program. In the end, you will come out ahead.