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The KAMI-OTO is a fun and easy to build DIY cardboard keyboard, it is velocity sensitive and can be bought on their Kickstarter in either Bluetooth or Micro USB for around $28.
If you want a cheap MIDI keyboard then this may well be the one for you!
More info on their Kickstarter!
Older Music Machines & the People Who Still Use Them
Developments for Korg's instrument have been slow but promising.