"A Patriot missile - usually priced at about $3m (£2.5m) - was used to shoot down a small quadcopter drone, according to a US general. The strike was made by a US ally, Gen David Perkins told a military symposium. "That quadcopter that cost 200 bucks from Amazon.com did not stand a chance against a Patriot," he said."
At least he, finally, admitted, ""I'm not sure that's a good economic exchange ratio," he told an audience at the Association of the United States Army's Global Force symposium in Alabama."
Though, depending on what the payload, intent, or target of the quadcopter was, it might have been a "good economic ratio" since he didn't inform the audience where/what it incident occurred (we can presume not here or Europe because I think, the public would've noticed.)