I have never seen this price so low for the robotic LEGO Mindstorms NXT 2.0 (8547) and I looked for more than a year to buy one for my son. Today, Amazon has it for $219 and this is a set for which you rarely see even a $10 discount. I bought it, and if you want to program and build, this set is for you!
LEGO Mindstorms NXT 2.0 (8547) 
Features
- The intelligent NXT Lego brick features 32-bit microprocessor, a large matrix display
- Three interactive servo motors; four sensors(Ultrasonic Sensor, 2 Touch Sensors and the all-new Color Sensor)
- Color Sensor has triple functionality: Distinguishes colors and light settings, and functions as a lamp
- Easy-to-use software (PC and Mac) with icon-based drag-and-drop programming and 16 fun building and programming challenges
- There are 612 pieces in this product
- Batteries not included with this product
- Building instructions for 4 new amazing robots
- Four input and 3 output ports, and Bluetooth and USB communication link
