Woot.com has Genuine Arduino Mega 2560 for $20.03.
Mega 2560 is designed for your most ambitious projects which require additional pins and extra memory.
Based on the 8-bit AVR microcontroller ATmega2560, it has 54 digital I/O pins, 16 analog inputs and a larger space for your sketches.
Ideal for: 3D printing, CNC robotics
https://sellout.woot.co