Sounds like your best bet would be some sort of fund raising. If your school doesn't already do this, I would look into magazine sales. My schools makes a killing doing this and its our biggest fundraiser by far each year

Dear Mike,
We purchased a climbing wall that attaches to our gym wall. Unfortunately, it is still sitting in the box two years later. There is a glitch with our insurance company and it can not be installed until it is worked out. Please check with your school's insurance company to see if it will be covered.
... Sue