Hi guys, this may be a very basic question, so bear with me. My company disburses my HSA deposit every 2 weeks at $139 a pop directly into my Fidelity HSA account. What should I "invest" in when I receive each $139 deposit? I can't exactly wait around until I have enough for the index funds which usually have have a $2500 minimum. I also don't want to invest in stocks that have trading fees since $7.95 every time I buy $139's worth of stocks is like shooting myself in the foot. Help a noob out?