I refuse to buy reloading supplies locally. The only big-box that carries powder/primers is 'Field & Stream' and they carry only a few powders; all overpriced by, at least, 15%. The only 'full-service' LGS in the county charges about the same simply because, for most local shooters, he's 'the only game in town'. There is, however, a GS in small town about an hour's drive south that carries a full array of supplies at, pretty much, 'suggested retail' and I'm usually down that way every six weeks or so.
Bill