Most school districts could outsource their grounds and building maintenance and save a lot of money. Another area is cafeteria outsourcing. Another area is bus transportation.
Any area where their is a lot of hardware tied up that is only used for a few hours a day or a week is a candidate for this.
Another idea is for local districts to stagger their hours so they can use the same buses and drivers and thus split the cost.
Small changes in lots of areas can add up to a lot of money in the long run.