Poloniex, its where I bought ripple, I think bitfinex have it too. Its not hard to find ripple to buy, you need to hurry price is already rising after long time. I hope that soon we will be able to say goodbye to 0,25$ where price were for months. Couple days ago price started to go up and I think this time it will not stop rising.
I have some ripple but I plan to buy more, very nice coin with future I think.

It's a good idea!
cons: depending on how you buy your BTC, the current minimum tx fee will be the downside
it would cost you (or seller) significantly high when dealing with low amount transaction
if you can find a way to reduce the fee close to negligible, it would be perfect