Santas are at 181mil, they are sitting kind of stable there at the moment. You should buy one for Christmas since a lot of people say they peak at that time.
Everyone and their mothers are pushing the prices for Santa Hats up and down right now.
Santas are going for around their GE price at the moment, I suspect there will be a slight drop on the med price in GE when it updates tonight.
Wait until the next big dump, and after it has fallen hard for 2-3 straight days, try buying it for lowest or even med price. Even if it falls after that, it will pick up quickly enough.
But they are pretty much stable as of right now. I sold mine in GE today for mid. I think it will drop a slight bit within a day or two then just rise again. I had to sell it to buy a IRL item though.