What school and major are you going to apply for at UIUC? Aside from DECA, your ECs fit better for your pre-med intention. Fit to major is important in the admissions process at UIUC, including the two why this major essays. Are you thinking you would be in Gies and take pre-med classes? Gies is a small school, so that makes it hard to get into.
Your chances at UIUC are likely better if you choose a school for your first major that’s not in Gies. Then, you might consider DES as your second choice major to maximize your chances of admission to UIUC. DES would give you time to explore what you want to do, while keeping the doors open to all the various schools/majors (except CS in Grainger.)
I don’t know if UIUC will get below $25K for you. Does your family meet the criteria for Illinois Commitment? Illinois Commitment – Office of Student Financial Aid or Illinois Promise? Illinois Promise – Office of Student Financial Aid
Can you live at home and commute to any of the schools on your list?
For UIC, Marquette, and Iowa make the EA deadlines. For Loyola make the priority deadline of Dec 1. I don’t know if any of those schools will get to your price range, but still apply.