I'm not sure what leads people to the panic purchasing. It took several stores to accumulate this much. We will try again tomorrow.
Update 3/16/20:
Our schools have decided to shut down through April 3rd. We will be 'distance teaching' beginning Monday, March 23rd. Right now we are all self quarantining and using Google Hangout (video conference calls) to connect with each other as we set up the system for the students to receive their lessons moving forward.