I went into the Soo Foo Fleet Farm last Friday afternoon and was surprised how much ammo and canning supplies they have. Some supply chain USA internal must have gotten unconstipated...
I think all the normal sized canning stuff will all disappear again once people's gardens and orchards start producing. It sucks when you have to put up the fruits of your labor and can't. It's best to stock up when you can. If everything falls apart, the ability to store food for the lean times of year will be very valuable.
It's best to stay ahead on sugar and vinegar too.
Keith