As Sheridan said, it's nice to be able to buy your ammo locally. I'm helping to keep someone in my community employed if I buy at the local store. The cost increase I pay is slightly above the cost I would pay when you add in shipping as well. A few extra cents per round will not break the bank for me.
If not locally, then at least you want to get the same/similar rounds in the worse case scenario from the local gun shop where you are hunting.
Everyone forgets/loses their ammunition at some point in time. It happens to the best, and worst, hunters around.