1PCS Metal gear Digital MG90S 9g Servo Upgraded SG90 For Rc Helicopter plane boat car MG90 9G , Top Electronic Company, http://aliexpress.com, US$2-49 x 1 Robot motor tire wheel + couplings shaft for robot DIY model toy car robots accessories aperture 3MM/4MM/5MM/6MM/7MM 2 wheels with 5MM apertures required. Ashers Fashion Store, http://aliexpress, US4-92 x 2 Arduino Uno x 1 (local store) NZ$39-90 Arduino compatible 5V stepping motor and (ULN2003) driver set (local store) NZ$13-90 x 2 Arduino (HC-06) compatible Bluetooth module (local store) NZ$26-90 x 1 The last three items are cheaper if sourced on line, but if you buy everything on-line then you may not have a local store ;)