To cost money.
save for a rainy day
To keep some money back for possible expensive problems in the future.
give back
To contribute money, goods, or, especially, services for charitable pu…
money is no object
No price cost is too great to achieve a certain objective; all efforts…
nickel and dime
To charge, or be charged, several unexpected small amounts of money, o…
paisa vasool
bang for the buck; cost-effective, value for money, worthwhile