Concerns about money are both the biggest cause of stress for me, as well as a byproduct of being stressed out.
I have talked before about how I like to spend when I am manic, but I also spend when stress levels are high, even if my mood is normal. When I am stressed out I like to go out to eat or buy a lot of fancy groceries to eat away my stress. I buy a lot of liquor, often expensive Scotches, or craft beer to drink away my stress. I go buy clothes or tools or concert tickets to stop thinking about my stress.