All the parts are to be sourced from the cheapest possible source.

Part List

Flight Controller	Racerstar StarF3S 30A BL_S 4 In 1 ESC 5V BEC w/ F3 Flight Controller AIO OSD BEC Current Sensor (13 builds) Banggood.com	$61.96
Motors	4X Racerstar Racing Edition 2205 BR2205 2300KV 2-4S Brushless Motor Black For 210 X220 250 280 RC Drone (13 builds) Banggood.com	$35.41
FPV Camera	Banggood (130 builds) Banggood.com	$15.45
HD Camera	HMDVR-S DVR 4:3 640*480 NTSC Video Audio Mini FPV Recorder for Micro FPV RC Drone (8 builds) Banggood.com	$9.99
HD Camera	GoPro Hero5 Session Waterproof 4K Video Camera (302 builds) Phaserfpv.com.au	$299.00
HD Camera	Foxeer Legend 3 UHD 4K FOV 155 Degree Wide Angle WIFI FPV Sport Action Camera with OLED For RC Drone (5 builds) Banggood.com	$149.90

Budget Racer