Ways to "save" when you already have the money?

So I'm thinking about buying my first "serious" watch (as in a 1k watch when my current most expensive is $100) I have the money to buy it, but it feels almost unearned to just do it without saving up for it in some way. Does anyone have tricks to "save" money in this situation? I tend to be an impulsive buyer when I find something I want, so also want to curb that by earning it over time. Appreciate any advise!