Quoted:
What caliber/origin are you speaking of? The ammo supply is normally cyclical.
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You nailed it.
If you watch the ammo supply over the years, you'll notice that at times certain calibers temporarily get in short supply. Stuff gets held up with BATF and Customs while guys keep buying. It eventually gets through, but everybody goes into panic buying mode at the slightest hint of a supply crunch and usually pays too much. A few years ago, .223 imported surplus was being held up and people had resorted to paying $155/case for reloads. Anyone remember Melisha's ammo? Good reloads, but still...
Take it easy, don't panic. It may or may not be drying up, but these things ARE cyclical. Even if it is, there will be more in a couple months when BATF and Customs get off their asses.