I'd like to put back around 10 or so small, easily concealable handguns for post collapse trading. Right now I'm leaning toward a few Ruger LCPs, MP Bodyguard, and maybe one or two of the new mossberg mc1. Should I be looking at how common mags, parts, ammo etc are? Or just go with the cheapest options and be sure to have a few hundred rounds and spare mags to go with each one?

To be clear, I'm keeping my glock 21 for personal use, I don't plan on using these ones for anything but barter.