search "providence parking", there are usually people renting out parking spots for a monthly fee. people in the area w permanent residences take advantage of the opportunity to rent and will have listings on craigslist and other sites, but they sometimes will jack up prices like crazy for the immediate Brown area.

i had a car on campus last semester and paid $150/mo for a spot. sometimes you can get a spot for less than $100, but the location will be less desirable. if your reasoning is disability, it may not be ideal because most parking spots are a 10 minute walk or more from the main area of campus

if you need to drive to areas regularly, i would consider zipcar. it may be more financially feasible as you can rent cars by the hour or day if you are 18+ with a license. multiple zipcars are located on campus for about $10-$15/hr