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I'm not sure where you are located but Fred's Gun and Repair in Delhi,ON usually has a box or two in stock.In fact they normally have a fairly good stock on hand of some of the older, harder to find numbers.
Go with the Starline brass Lunit mentions. Remington is seasonal only. Temporarily unavailable(ammo's seasonal only) from Winchester. All brand are out of stock on all the U.S. sites. So is the ammo. Except for Black Hills.
Try Epp's though.
Where you are matters too. Buying ammo on-line gets expensive fast.