Getting into medical school entails a variety of costs, not the least of which is your four years of undergraduate education. But here are some additional costs to consider in your planning:
Interviewing: Travel costs can include gas, lodging, meals, and airline travel.
Acceptance deposits: M.D. schools can only ask for a $100 (refundable until April 30) deposit. Some Osteopathic (D.O.) schools ask for up to $3000 as a deposit, and most are non-refundable.
As you can see, the additional application costs can add up quickly. I recommend budgeting $3000-$5000 for each admissions application cycle.