Spare no expense/pains/trouble doing something - Idioms by The Free Dictionary
spare no expense/pains/trouble doing something
spare no expense
To spend as much money as necessary to do something the best or most extravagant way possible. This is our company's 50th anniversary celebration, so we're sparing no expense. Wow, their parents threw a great dinner party. You could tell that they spared no expense.
spare no expense/pains/trouble (to do something/(in) doing something) spend as much time, money or effort as is necessary: His twenty-first birthday party was amazing — his parents had spared no expense. ♢ The ship’s crew will spare no pains to make your Mediterranean cruise unforgettable. ♢ It will be a wonderful trip, no expense spared.