Dear Sweta,
Cost cutting has become a tread now, and every org is implementing it after recussion period.
You question is genuine, and the replies you got may motivate others also to implement the same in their organisations.
We also have are trying hard on cost sutting, just imagine urself how good a home maker you can, a good home maker is one who allocates a budget in the beginning of the month and works out to meet the goal at the end of the month.
So, my suggestion is BUDGET.
Give a budget to each department, and if they cross that, they will be waived of the service.
Make a budget, keeping in view the expenses incurred in the last 3 month average and + 20%. and u can have a margin of addition 10% with out their knowledge.
Hope u like my idea.
Regards,