since hundred bucks is not that much, you can really put it anywhere.. as losing that amount of money won't be anything significant or won't affect you in any way (in a big way at least). What you can do is try trading some smaller cap coins, but if I were you - I'd go for an ICO, or initial coin offering. What this is basically, is a project that just started and is looking to raise funds, that's quite a typical think that happens in traditional business and raising money for them is called an IPO or initial public offering. Since your amount is relatively small, the best chances for you to multiply it significantly is to join one of those ICO's and go all in with it. If you're going to invest some more cash into this then you can buy some top coins. Forget about trading, you'll waste your money and time.