Syma 11X Quadcopter w/ TX02 FPV
Probably the cheapest FPV Drone you can make with minimal things while keeping it quality.
-Eachine TX02 Super Mini AIO 5.8G 40CH 200mW VTX 600TVL 1/4 Cmos FPV Camera ($25)
-Syma X11 R/C Quadcopter ($20)
-HEIOKEY Upgrade 3.7V 520mAh 25C LiPO Battery ($5)
DVR - EACHINE LCD5802D FPV Monitor with DVR 5.8G 40CH 7 Inch OSD Dual Receiver Build-in Battery (records in 25fps)