If you want to shoot it regularly, look for the swiss surplus ammo. It's called GP-11, and it's non-corrosive(!), brass cased(
berden primed) and darn near match quality. It's currently about $.50/round, and it's worth easily twice that. It can be found pretty easily online. EDIT: Hornady also loaded a hunting round for it for a while, it can still be found if you look around a bit.