Hi Sneaky. All the pieces of the Midi controller cost approximatively 200 $.
I can make it for 350$ in one Month (because of the part receptions (approx 2 weeks for the Midi controller card)
I live in France.
The shipping cost depends on where you live. From 20 to 60 $
If you want to talk about that : http://www.facebook.com/franckgraziano
