When I'm out cruising in a hunting area, and stop in at a shop that sells ammo, I check or ask if they have my oddball calibers (.280 Rem) in stock. I'm not insulted if they don't carry it, but if they do, I make a note of price, and quantity for another visit. Sometimes, I've bought a couple boxes that were great bargains at old prices. Lots of this stuff gets discounted substantially at the end of hunting season too.
Found some old Green & White boxed Federal Premiums w/150 NP that I've yet to match for accuracy that way. Wish they had more.