It's not just a matter of putting people in a freezer; if you do that, ice crystals will form and totally destroy the brain structures you're trying to preserve

It's not just a matter of putting people in a freezer; if you do that, ice crystals will form and totally destroy the brain structures you're trying to preserve. The actual procedure involves pumping cryoprotectants into arteries very shortly after death (it has to be quick). Nearly all of the cost is in the procedure performed at time of death; once that's done, long-term refrigerated storage is trivial by comparison.