USB microB Cable - 6 Foot - Retail - optional but if a complete kit is wanted - out of stock of non retail Jumper Wires Premium 6" M/M Pack of 100 - 1 per 3 chassis should be good. On here for lab supply
Sensors: 2 bump sensors (simple way to add an "autonomous mode) 3 line following sensors (optional - good expanded learning) 1 3 axis accelerator (optional - good expanded learning) 1 Remote control retail package (includes extra leds and receivers, adding parts seperatly comes out to be about the same without spare parts)
Base learning platform bot (assuming we used existing Arduinos for remote controlled robot): Motor / wheels / encoders - 20 bot chassis - 13 Remote - 10 Motor controller - 8 Bread Board - 5 Total = $56