1) Take that $100K. 2) Get a summer job: $10K - $15K saved right there (more if you do a hedge fund / finance gig over the summer) 3) Get a job over IAP. Another month's worth of salary. 4) Get a job at MIT. MIT's great about giving opportunities for students. You can get paid to do research through the UROP program. You can get paid be a grader, a lab assistant, a TA, a deskworker in your dorm (i.e., get paid to sit around while you do your psets) 5) Start a business 6) Get a job somewhere else. There's plenty of people willing to hire MIT kids part time, and plenty of those pay very well 7) Start a stock trading operation in your dorm 8) Learn poker 9) You get the point
One other thing you might try is to petition for financial aid and explain your situation. MIT typically lets you petition anything, although I don't know if that applies for financial aid.