No Swiss Mausers, in 6.5x55 or otherwise. Swedish, not Swiss.
Briman's prices reflect a C&R FFL. $119 is a pretty decent retail for a K-31. Ammunition was limited until just a few years ago to big$ Norma. Now Swiss surplus is available, along with boxer primed ammunition and brassimported from Europe. In a pinch, brass can be formed from .284 Winchester, if ammo dries up again.