What is a good online school to go to?

This fall I plan to go back to school for my AA in psychology, and wanted to know what are some low-cost, but good online schools to go to? I have thought about going with Liberty online as opposed to University of Phoenix (UoP made it very hard for me to enroll and they’re very expensive). Can someone recommend a place they’ve gone to that didn’t hassle you over online options and cost less than UoP?