Often, when I work with clients, and even sometimes in my own life, I buy something new, when I already own it. I’m talking about things as mundane as tape, Qtips, and lip gloss.
Before shopping at the store, take stock of what you have. The best way to do this is to take everything out of a cabinet and take stock. It could be in your pantry, your bathroom, or closet. Often, you will find duplicates, or near duplicates of something you already have. Those duplicates can be labeled and stored, or tossed, so you can better find the things that you need. Maybe you only really like one of five mascaras. You can toss the rest.