I believe OP said not horticulture or botany.
There are a lot of OOS publics with great ASD support programs, but need-based aid for OOS students tends to be very limited. I can’t imagine how UIUC could be affordable. If I thought the aid would be there, I would suggest Appalachian State in NC for its ASD community/supports, but even their big scholarships don’t cover OOS costs.
Hofstra is definitely worth a look, though; they have a long history of inclusiveness.
St. Joseph’s in Philadelphia is another Catholic U, like Marquette, that has a strong ASD support program.