I was so sorry to hear yesterday of Mount Ida’s closing. While none of my kids have attended, my son did consider it briefly. And the closing of any school is so very hard on all those students who attend or have been accepted to it.
For starters-- are you from New England? Will this help? http://www.nebhe.org/programs-overview/rsp-tuition-break/overview/
Here’s a list of schools in MA with prices similar to Mount Ida that have your major:
https://study.com/interior_design_courses_in_massachusetts.html