For a family of 3 with an annual income of $100K and only 1 child (the college applicant), here are estimates I get from several schools’ online net price calculators:
$31,507 Creighton (private; assuming $20,252 EFC, 3.9 GPA, 32 ACT)
$30,024 University of Colorado - Boulder (in state public)
$22,494 Colorado College (private)
$21,990 Colorado State (in state public)
Input your own numbers for more reliable estimates. Note that despite very high sticker prices, some private colleges do have competitive net prices for families in your income bracket. However, the ones with the best need-based aid tend to be at least as selective as Colorado College.
(https://www.coloradocollege.edu/offices/healthprofessions/frequently-asked-questions/)
If your stats qualify, you could do better than any of the above numbers with an automatic merit scholarship listed on the following site:
http://automaticfulltuition.yolasite.com/