Otzi the Iceman died at 10,000 ft in the Alps 5000 years ago, and according to scientists his body and his brain in particular are well preserved. We have several mummies that died at elevations of 17 to 22,000 feet in the Andes about 500 years ago and they're exquisitely preserved in cluding their brains.. plus we have permafrost animal recoveries from up to 50,000 years ago that are well preserved up in the Arctic.. therefore high mountain and Arctic permafrost burials are quite possibly valid avenues to being resurrected in the distant future.. at a very low cost of course, possibly free, depending on how you do it