Neither of them counts as "cheap" by any definition of "cheap".

Dollars per expected day of life extension. Applying the same definition to other health investments makes cryonics the 'cheap' option. I agree that this is probably not the definition used by some advocates.

It's also at least an order of magnitude more expensive than what Eliezer keeps talking about ($300/year).

Yes. (Well, if you use binary or base 4.)