A few ideas - 1. give people/businesses a chance to donate and be recognized for their donation. Gift bricks help to bring in some of the cash.
2. Talk with the purchasing director in your school district. They will ulitmately be buying the play system and responsible for it - so see if they will take on the costs associated with installation and site prep.
3. Talk to your city Parks department. We put in our system and were prepared to pay for it on our own when we met with the Park & Rec department. They came in for 1/2 the cost of the structure as in most situations our schools are neighboring a park or utilized by the parks department for summer activities.
4. The Home Depot grant agency is
KaBOOM! Home
they help to fund some ideas. They are centered down south - so they may be more convient to get to for you.
5. Have another purpose to your structure besides riding the slides. Rock walls, reading mazes, creation centers become appealing to other outside agencies such as the Optomist, Kiwanis, Rotary etc.
Have a fun time and enjoy the ride.