Project materials
3 Servo motors – $8 each
http://www.ebay.com/itm/like/390785141247?lpid=82
3 plastic wheels
amplifier – Radioshack ($14.99)
http://www.radioshack.com/product/index.jsp?productId=2062620
sheet of paper
(free)
headphones cord
(free)
pen
(free)