99% of the time, its provided. But for a MK2, you can buy a power supply for fifty dollars. If it's a MK1 then don't buy that item, on account that it's really hard to find that item.
The MnM doesn't have any USB, only MIDI. Which you could get the TM-1 that's commonly used with the MDUW, or you could just use any MIDI to USB conversion thing or interface(if your recording interface has a MIDI that will work). (The MDUW is the same way as the MnM when it comes to this)