You will need:-A two digit LED display
-8 220 ohm resistors
-1 68 ohm resistor
-1 100 ohm resistor
-20 male pin headers(optional)
-SPDT toggle switch
-Bolts & nuts/banana jacks/binding posts(you decide, I'll discuss this later)-A tone buzzer-A low voltage electrical igniter
-5 x 2.5 x 2 project box(optional)
-Power supply for Arduino
-22 gauge hookup wire
The total cost comes to around $8 or $13, depending on whether or not you use the project box.
Also, this design is only capable of lighting a very low power electrical igniter or light. If you want anything that uses more power, you will have to use an external power supply.