Okay, I'll join in to this Zombie Thread. If you have the money for uninsured elective surgery, here's some to consider (for the serious prepper only):
Lasix, as previously mentioned (won't have to prep eyeglasses, could improve your aim)
Tonsils and adenoids removal (if they haven't been already)
Wisdom teeth removal (they could erupt later in life causing trouble, mine did)
Full spectrum vaccinations (including tropical diseases in case of global warming)
Facial hair electrolysis for the men (don't have to prep shaving cream and razors)
Appendix removal (don't know if you can find a doctor to go along with this one)
Spleen removal (just in case you fall (or get thrown) from a tall building)
Titanium knee joint replacement (might as well get ready for the inevitable)
See better, run faster, jump higher, become the Bionic Prepper. We HAVE the technology! (No, I haven't been drinking, I'm on a Trump-Intoxication.)