One cryonics company, in Michigan, refuses to take suicides at all. One, Allot in Arizona, is self-obviously a cult. One in Oregon is fine with suicides ad seems pretty legitimate, but you have to be in their city when you die, and really they need to be on site at the hospital.

I think that the best way to do this is to go buy the membership, then check into a hospital in that city with something trivial, like a stab wound in the keg, and then kill myself while overnighting in the hospital. Probably use sodium nitrate to do jt.