Buy btc from coinbase, then withdraw it to an expansion or shapeshift and there you can easily get some ripple. Pretty sure this is the only way to do it.
Friend, I don't seem to trust shape shift a lot of ways and I won't suggest it to this community rather TRY OUT Bittrex or Poloniex, or Binance. At least you can be sure of these ones.
Thanks
Just My Advice.