On the DRKBTC orderbook on Bitfinex. For the first time I have seen a bid price which is below zero. I guess when it goes that low people are willing to give coins to you for selling.
Speaking of that the value of DRK has nearly doubled recently. Dunno whether it will keep rising (due to new privacy features on the coin) or drop sharply (due to people selling when they bought at sub 1.70s last week), so I should probably get a few at this point but have a larger buy order near the bottom just in case.