Remember the Philips Mirrorwall? It's a wall made out of white Lumiblade OLED panels and a camera, and it basically acts as a mirror, display shadow reflections of people standing in front of it. It turns out that Philips are actually offering this limited-edition wall. The price? about 10-12K€ per m² (they'll made it just for you). That's one expensive mirror... But what a spectacular one!
If you want a cheaper option, you can also rent the whole thing for about 10K€ per week (excl. transport, insurance and approx. 3 man-days for installation and dismantling). I'm not sure how large the rented wall will be (in the video it seems rather big).
Here's another video of the MirrorWall: