In reply to Runner_bean87:
You have options:
1)Use less to make it last longer (I try not to use it much because it's bad for my skin).
2) Climb less and become weak.
3) Take the hit (It's only £2 a ball isn't it?)
If you take a good dip as much as most boulderers do, yes, it is probably normal to use up chalk at that rate
Cake