TomTop offers the Worlde Panda Keyboard and Drum Pad MIDI Controller for $37.99 with free shipping. (Choose "China Warehouse" to see this price.) That's the lowest price we could find by $9. It features 25 keys, eight backlit trigger pads, four assignable control knobs, four assignable control sliders, four banks, eight control buttons, and USB 2.0 cable.
Note: It ships from China and may up to four weeks to arrive. The countdown timer on the product page does not reflect an actual expiration time and resets daily.