I think that the surplus ammo market has dried up. Reloading is probably the most economical choice, but as far as I know, the dies are designed for .329" bullets, which are usually too small for an M95. There's a whole do it yourself industry in modifying Lee dies and sizers to make 8x56R bullets out of .338 cast bullets.
I don't shoot mine very often, so I've just sucked it up and bought a box of Prvi ammo every now and then. I do save the brass, so one of these days...