Considering some random observations I made during a recent trip through the Pacific Northwest, ammunition availability seems weirdly spotty.
In one "general store" there was all sorts of handgun ammunition on the shelves, across a wide range of calibers, and the prices seemed pretty reasonable (compared to usual CA prices). Federal, Winchester, Remington & Speer for the major brands, and a couple of foreign brands, as well.
Just a few miles away, at the other end of the small town, the local WM store had mostly bare shelves. Even the rifle & shotgun ammo was mostly depleted (unlike the other store, which was plentiful).
Didn't stop in any dedicated "gun stores", so I didn't see the situation in any of those.