This project is pretty cheap and really doesn't need that many parts, the parts we will need are:

• Arduino Nano (here) 
• Hc-06 Bluetooth module (here) 
• Motor Controller (here) 
• 2x geared motors (here) 
• 2x 220-ohm resistors (here) 
• 2x push buttons (here) 
• LED (here)

And for tools and materials we will need:

• Cardboard 
• Wire 
• soldering iron and solder 
• hot glue gun and hot glue 
• Box cutter