Meet the RaceBlade FPV Racing Quadcopter: a lightweight FPV racer with removable arms and a tough airframe for drone racing. The 4mm thick arms support 4″, 5″, and 6″ propellers. You get multiple motor mounting holes, Lumenier Neoprene Landing Pads, and bumpers to protect the motor during a crash.
These quadcopters can be used to carry a GoPro or other HD action cams. You can get yours for under $115.