Ultimately, the purpose of a goal is to give you something to work towards and a sense of direction. When you focus on that particular goal, you’ll be able to weigh whatever purchase you are considering against it.
The thing about mailing lists is that all these companies you’ve shown interest in or supported before will keep flashing all their products at you and you’ll start thinking you need them. But you don’t.
Instead of every one of you buying the same item that you keep in storage and only whip out once a year, there’s absolutely no need to invest in those items, especially if it’s something that can be borrowed.
Once you learn to set boundaries and limits, your spending becomes a lot more controlled and you’ll get out of the habit of just buying things because you have money at your disposal.