If you think that UNI is a suitcase school, what makes you believe that U of I or ISU will be any different?
There is more "suitcasing" at the beginning of the semester. Once people settle in to their classes, and start facing exams, fewer of them will be able to run away on the weekends. So, I suggest that you plan (for now) to just stay put. Give yourself a change to get to know your university (after all you did choose it over U of I and ISU in the first place!), and give yourself a chance to meet some of the other people who are on campus during the weekends. If you still are miserable at winter break, you can re-consider the community college option for second semester. You would be able to withdraw from UNI and enroll at your community college on very short notice.
Don't try to take any additional online classes right now. You need to focus on getting good grades in your current coursework. As for transferability of specific courses, email the U of I and ISU transfer admissions offices and ask about it. They should be able to help you find out the answers to your questions.
Wishing you all the best!