Just an abstract thought to add to the list: tarps (the bigger the better, and the heavy-duty variety) came in pretty handy during the storm last month, as did fans to move air around and dry things out. People that had damage needed them, and people that had the items but no damage became really popular very quickly. Much like ammo, those items are not given much priority in good times but become highly sought after when the shelves are empty. ...tarps are widely available right now and not all that costly.
One person I know was in the midst of a $13K re-roofing when the storm hit and was very thankful to have some large tarps to cover the exposed sections.