That Blood Circus print has been on eBay a couple times over the years, it has never sold. The original auction in 2011 had a starting price of $21 million, and a Buy It Now price of $750 million. No, really, I'm serious.
That makes $3500 look like an absolute steal, for supposedly the only existing print of this film in the world. Someday, someone has to buy that damn print.