having your kids live at home is one way to really help out with expenses. Room and board is at least $10K per year, usually more.
Something else - if you spend $4000 in qualified college expenses for each student (tuition & fees - NOT room and board) you can get back $2500 as a credit on your taxes the next year. That’s a helpful chunk, which can be saved for the next year. That’s called the American Opportunity Tax Credit.