I'm going to try this tommorow. I think I have a good exchange website where this would work. If not it doesn't really matter, if it does. I'll reply again.
Use small amounts at first, notice the comments from people who lost money because of maintenance wallets, price fluctuations etc.
For the last week bcn has had an enormous spread between cryptopia and poloniex.
Right now you could buy a btc worth at cryptopia at 127 i.e., 780,000 bcn and sell them on poloniex at 187 for 1.45 btc as long as both wallets work, price does not move quickly against you, no security issues, no other problems etc. Some risk but fair potential gain.