Mimikyu Munch Promo Price Skyrocket

So I have noticed that within the past week or two the price of this card has skyrocketed to over $100. What is the cause of this?

It’s being discussed in the scream promo thread at the moment
www.elitefourum.com/t/new-sm-promo-the-scream-psyduck-eevee-released-nov-2/21896/1

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