Massdrop offers the Samson Graphite M25 USB MIDI Controller, model no. SAKGRM25, for $49.99 plus $5.72 for shipping. That's the lowest total price we could find by $21. It features a 25-key semi-weighted keyboard, programmable master encoder, eight MIDI assignable knobs and controls, four velocity-sensitive trigger pads, mini USB, and Graphite Editor software. Deal ends December 18.