A starting place is to look at operating expense budgets and divide by number of students…which can be hard to do for schools with lots of grad students (need to get just undergrad operating expense numbers). Note that financial aid is not included in operating budgets, as it is an offset to gross revenues. There may be also be idiosyncracies at to what’s included in a given school’s operating budget, for example some endowment investment group’s salaries and expenses are funded out of their returns, and don’t appear in the expense budget.
Schools with higher endowments tend to have higher spends per student, which seems obvious. But even schools with relatively high endowments have undertaken cost cutting measures in the last few years, such as Middlebury Colleges.
Here is an analysis of Bowdoin’s cost per student: https://bowdoinorient.com/2019/04/12/how-does-bowdoin-spend-its-money/