I've been playing Fallout 4 on survival mode and have been trying to scavenge every piece of equipment that helps keep me from dying. To this effect, I've been arming my settlers with sets of power armor and strong weapons. They're too likely to be killed by raiders otherwise and leave my settlements undefended.
While I can find some decent weapons on most enemies I kill the power armor frames are a little more scarce to find. I've seen power armor frames for sale at a few merchants. Does this mean that as long as I have the caps I can buy more sets upon merchant restock, or is their supply finite?