I had no idea that there was a market for audio interfaces for DJs, but there is a whole world of DJing that I am completely oblivious to. 

Native Instruments has come out with the Audio 2 DJ, a pocket-sized audio interface for DJs that “boasts the ultra-loud, professional sound quality needed to rock the world’s biggest clubs”.  It should be available in September for a price of about $119. 

Can’t wait?  Watch the YouTube video of this guy free-running to get into the groove.