You can do it for less than that, even. A Naza M flight controller costs $200 (http://www.uavproducts.com/product.php?id_product=21), and that's one of the more expensive controllers out there. The remainder of the components for a flying wing would run you $80-$120. You could replace the Naza M with a multiwii controller and write your own flight control program for much less. These are multicopter components but there are analogous components for gliders and planes. Then there's the GoPro, a used one of which might cost $150. I guess you can do this for an all-in price of less than $600.