I needed a mop.
Sandwich boards, which I've only been able to find in Germany. When I was in Stuttgart, I picked them up. We were almost at the end of the no-buy year.
1. It be useful
2. It be beautiful
3. It carries a memory.
These purchases met numbers one and two.
Thus, I don't see how a no-buy month will help since I always think and rethink most purchases. Most of the time I don't need what I looked at.