Have bought it here but I picked it up, so not sure how much the shipping is. Called edge protectors. Any place that sells supplies for building wire cages might carry it.
You can get door guard at Walmart or any auto store that works the same as the wire edge guard, usually cheaper. That is what I use on all my cages. I don't like the chrome look one, I use the black or whatever color they have available. Hope this helps!