I have this effect. WOW is one of the best visual gadgets I have ever seen. You show a 'see through' perspex case (its a mesh kind of thing) and it's empty
You have a card selected, signed and returned
You show an indifferent card (such as 8H)
You clearly place this card into WOW and show both sides, they see both the front and back of the indifferent card, suddenly the card SLOWLY and visually turns into the signed selection, the spectator can remove the card and WOW is once again empty and transparent.
It's NOT a hologram
It's about ?40 here in the UK
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