Fred Katayama from Reuters reports that a New York burger joint named Wall Street Burger Shoppe is selling a gold-flecked Kobe beef burger fried in foie gras for a meager $175. Reuters says $175 but the online menu (PDF) lists the Richard Nouveau Burger at $150. Here's the listing from the restaurant's menu. It could be that this is the burger minus the gold flecks.
Katayama notes in his video report that downstairs you can get a regular burger for just $4.