Lowes and Home depot have it. It is in the garden center. Ask for Chicken wire, it is in the same place. If they do not know what chicken wire is, shoot them for being completely ignorant.
We usually get it from tractor supply, they are usually the ones open when we need to go get some, and Lowes and Home Depot are both about 50 miles away. Otherwise, if we plan well, which we never seem to do, we get it at either the coop or at the feed store.
At my TSC they had rolls of something called "cage wire", as well as the hardware cloth. I have no idea what the difference was, but I'm sure I'll find out tomorrow when I go back to buy some.