Get into a new habit of saving. It’s as easy as this. Make yourself a promise. “Every $20, I break by buying something, and I receive a $5 as part of my change, I will save that $5″
So put it away, each and every time. You are no longer going to spend that or any $5 note. Before long, you will have put away a large fortune in $5 notes. Bet you can save more that $1000 in one year. Makes for a nice Xmas bonus!