I spent a little over $2,500 in the entire application process (MCAT, AMCAS, secondaries, interviews) and I only applied to 11 schools. While it may be tempting to scale back the number of schools to which you apply (I cut my list down from 16 schools to 11), unless you're a stellar applicant, I would consider it to be very risky to apply to less than 10 schools. If you underapply and walk away without acceptances, you'll have to spend a large sum of money next year in addition to what you spend this year. If you can't afford to apply to a good number of schools, I would consider getting a part time job. Do it right the first time.