Splurge /splɜːdʒ/ v.
I work so hard. I need to splurge every now and then. I deserve it.
Budget n. 预算
You have to make a budget for your spending every month. Then you could save for the down payment on an apartment.
Be made of money 很有钱
I know you want the new dress, but the answer is no. I'm not made of money.
You pays your money and you takes your chances.
I'm sorry to hear that the laptop you bought on that shady site doesn't work, but you pays your money, and you takes your chances.
Right on the money 恰好
This project is going to be finished right on the money. So we could take some time off after that.