International Student Looking for Affordable College

Hi! My SAT score is 1220, 670 in the English section, and 550 in the Math. My school does not have GPA system, however i think my GPA based on yr10,11,12,13 will be around 3.3~ ( i think, im not sure really). I have already been accepted into University of Illinois at Chicago, but its waaay too expensive. I plan to major in Computer Science/Software Engineering. My price range is anything up-to around $18,000-20,000 (including room and board, meal plan, tuition). Thank you for your time!