There is no stipend for rotations. You pay regular tuition for your rotations. At some schools this even means that you pay 3 semesters of tuition vice 2 semesters of tuition in order to get in the necessary rotations.
Nope. It's you who has to pay tuition. However, some schools are better than others with providing you free housing on out-of-town rotations. That may be worth checking out.