Canned good prices going up?

I popped into the grocery store yesterday because the cupboard was getting bare.

I was unpleasantly surprised by what I found.

This was the local WalMart Supercenter, mind you, and it is the first of the month - but the price on canned goods has gone up to 56 cents!

Not only that, but I noticed that many items were out-of-stock and several shelves were bare or had very little on them (not just food, though - dog food was what I noticed first).

So I'm curious - has anyone else noticed anything like this?

What is the average price of a regular can of corn, tomato sauce, green beans, etc. where you live?