Ammo at .17 a round and higher is available all day. Purchasing at this price supports the price hikes.
I've had luck today watching cabela's site for limited stock appearing after they go through and remove orders from people who exceeded their limit for the day. There was a comparison link...
They are currently calling customers who ordered more than their limit of ammunition when it was in stock. They personally cancelled 10 boxes of my orders. Stock is appearing as they do this.
If you keep an eye on the recently in stock ammo on Cabela's you may get lucky and catch some in stock...