I want to buy some ripple using bitcoin, but shapeshift sets a minimum for the transaction that is way above the initial deposit of 20 XRP necessary for an unfunded ripple wallet. At the moment of writing this, shapeshift requires a minimum deposit of 0.01451925 BTC, which is 93.43467259 XRP. But I don't want to buy so many XRPs.
Besides, changelly doesn't currently support ripple.