Last year in December (of 2015) I enrolled in a little-known application called Acorns. This company would look into your transaction history; all of your credit card and other purchases, and then round up to the nearest dollar from the purchase and take the difference. They’d these small amounts of money up, anywhere from 1 cent to a dollar, and once you had $5 available, would invest these micro-investments into a series of mutual funds.
I didn’t expect much out of this since we’re talking literally pennies per purchase. But I was wrong. Site after site emphasizes the importance of investing whatever you have to work with. So while I invest already in a number of different ways, I decided to give this a try. From $5 onward my balance slowly started to grow. Eventually I started to see returns outside of my investments as dividends were given and funds sold. I don’t ever expect this to become a nest egg for me, but I do use it for an emergency fund. I slowly invest as I make additional purchases, and it acts basically as a savings account earning around 3% for me. If I had an unexpected expense like maybe one of my cats got sick, I’d just withdrawal from the account and be on my way.
Normally you can get $5 when you sign up but they seem to be running a special where you will get $10 free for signing up. Check it out here.