He got there 'with (only) minutes/seconds to spare'. [=he got there only minutes/seconds before he needed to; he got there just in time]
When they go on vacation, they 'spare no expense'. [=they do not worry about spending too much money; they spend a lot of money]
He said that he would 'spare no expense' [=he would spend as much money as necessary] to make the restaurant successful.
(..) Good morning, little man. And how are you this morning? - Can I ask you a favour? - Well, you can ask. (GRETEL GIGGLES) Are there any spare tyres around? An old one from one of the trucks or something? Well, the only spare tyre I've seen around here belongs to Lieutenant Meinberg. (..)2008 The Boy in the Striped Pajamas