You can’t buy it. Somebody can wish it upon you, but that does not mean you will have it.
If you find that peace has departed from you, figuring out how to get it back is a must. What is it within you that is preventing you from having peace? Answer that question, and then you have the starting point to finding it.
At the end of the day, it is your actions that will make the difference. Do the right thing, and you will have peace. Do the wrong thing, and you won’t have peace until you make amends.