It could get a lot more expensive if you've gotten condensation in your brake lines. Given how cold it was last winter, I think that you should invest in a flush. There's a Track Forum that you should check out, particularly the Sticky's about getting your car ready.
Tracking your car can get expensive fast. If $1000 is testing the bank, then you might want to reconsider for now. Make certain you've got plenty of brake pad left and your rotors are in good shape. You might want to consider using a different pad. (See the Sticky's at that Track Forum).
Have fun, be safe.