Behringer is at CES 2013 this week and have announced a couple of new DJ Controllers.
The CMD Micro, pictured here, is the one specifically targeted for use with iOS Devices. It very much like the Numark DJ2GO, with the major exception being that the DJ2GO is on sale now and the CMD Micro has been teased since last March, with an expected release of last Summer. Behringer is not speculating on their release date or price anymore.
The big brother to the Micro is the CMD Studio 4A, which looks like it could be a very compelling entry-level DJ controller/audio interface. Unfortunately Behringer has not indicated if this is class-compliant, which would be necessary for use with iOS. Behringer has a terrible reputation for supporting their products with updated drivers, so I personally wouldn't trust anything from them that wasn't class-compliant. They are also known for being very cheap though and at $200, the Studio 4A would be among the cheapest ways to get into DJing.
Here is a video of both from GoFastJames.