Buy 6 bitcoins @ $500 and wait for the rise to get to $600 again and then sell....
$600 profit.... not much but it's a single way of gaining in the short to medium term...
Do you really think Bitcoin is going to tank below $500? I doubt it.... As a Government created monopoly dominating CryptoCurrency, it's probably going to rise again.... but you never know.... its current price could be due to Silk Road being taken down and the value when from in the x,xxx to a mere 500... a bit of a disappointment.....
It's one way... but with $3,000 you have tons of different ways to re-invest....
I have $750 which I am going to use to invest so you have more opportunities to dive into...
I wish you the best of luck, sir.