Most who shoot it shoot surplus so reloading for it isn't nearly as popular as, say, .308 or .30-06. I'm not surprised a local store didn't have dies for it.
You can order dies from most anywhere online. For brass I'd check Budget or TradeEx in the sponsor ads at the top. I lucked out when I started reloading for my Mosin and had a guy give me 150+ mixed, once fired S&B and Prvi brass cases. He didn't like shooting corrosive but also didn't want to reload.