This is the Grinch arm Christmas tree accessory handmade and sold by Etsy shop Craftadaykeepdocaway (can anybody verify that claim? my deductible is killing me). The $55 arms are attached to your tree via two strong wires and make the perfect accessory for the Grinch lover on your holiday list. Per one verified buyer:
Hoho, nice try Mrs. Claus, but I know that’s you! Twelve themed trees around the house — my goodness. I can almost smell the Christmas cookies baking from here and it’s only October. So, uh, is it too early to open a present? Come on just one I promise!