35mm? none...not even batteries in any of 'em anymore. I quite shooting 35mm a while after the local lab closed. My darkroom skills are just not good enough to coax a decent print from those tiny negatives.
Medium format is a different story however. I have two medium format cameras and at least one of the two always has film in it. I've always got at least a handful of 4x5 film holders with film in them ready to go too.